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* TemptingFate: In one of his audio logs, Paul Torgal laments that Maida, the mercenary accompanying the Degasi crew, [[TheCynic doesn't believe that things won't get any better]] and Paul thinks she wants to put their lives in danger, and claims that, since humans have spent millenia shackling nature to their will, the planet they're stranded on won't cause them any new problem. Guess what happens to the Degasi Crew in the end.


** Part of what makes ''Subnautica'''s survival atmosphere so intense is that you're told next to nothing upon starting a new game, and things barely improve from there on. There's no instructions, no tutorial, not even a friggin' ''map'', least of all something like a questlog (or even quests to begin with). The only real HUD markers you get are from the few ''Aurora'' survivors, and that ends fairly quickly. Afterwards you're completely on your own, and unless you consult a guide, you can spend hours upon hours getting lost in subterranean tunnel systems, wondering if there's even a point in risking your life down there, and if there is, what you're supposed to accomplish in this place. [[TropesAreNotBad May sound bad, but]] it makes for an epic adventure full of astounding discoveries.

to:

** Part of what makes ''Subnautica'''s survival atmosphere so intense is that you're told next to nothing upon starting a new game, and things barely improve from there on. There's no instructions, no tutorial, not even a friggin' ''map'', least of all something like a questlog (or even quests to begin with). The only real HUD markers you get are from the few ''Aurora'' survivors, and that ends fairly quickly. Afterwards you're completely on your own, and unless you consult a guide, you can spend hours upon hours getting lost in subterranean tunnel systems, wondering if there's even a point in risking your life down there, and if there is, what you're supposed to accomplish in this place. [[TropesAreNotBad [[Administrivia/TropesAreTools May sound bad, but]] it makes for an epic adventure full of astounding discoveries.


* RefugeInAudacity: Going straight towards certain aggressive creatures and attacking them with your knife is sometimes the best way to deal with them.

to:

* RefugeInAudacity: Going straight towards certain aggressive creatures and attacking them with your knife knife, or [[CarFu ramming them with your vehicle]] is sometimes the best way to deal with them.


* UnexpectedlyRealisticGameplay:
** It's not obvious from the start that oxygen tanks actually store oxygen rather than merely increasing your cap. If you have several in your inventory, each has its own supply and can be swapped out as the equipped one depletes. Similarly, each individual tank must be refilled with air by equipping them.
** Also applies to the game as a whole. The vast majority of contemporary survival games have tutorials, quests, map markers (not to mention a map in the first place), a more or less strict narrative with a clear ultimate goal, and so on. ''Subnautica'''s total lack of any hand-holding can be baffling to new players until they switch their standard video-gaming expectations back to common sense and think about what anyone who's stranded in uncharted territory would do: survive the first day, come up with a plan to get the hell out of there, and then survive long enough to figure out how to do just that.
* UnderTheSea: Almost the entire game takes place in the ocean, with [[spoiler:a couple of islands]] and the non-submerged half of the ''Aurora'' being the only exceptions.
* UnderwaterBase: You can make these using the Habitat Builder and raw materials such as titanium and glass.
* UnstableEquilibrium: The beginning of the game is almost exclusively about basic survival: getting food and water to stay alive long enough to get equipment to survive the planet's dangers. Obtaining the means to farm your food is a huge step in freeing up time to spend on exploration, but certainly isn't the only boost forward.
* UnwinnableByMistake: There are a number of ways to get yourself stuck in the deep sea with no way to continue the game, exacerbated by there only being one single savegame per campaign and no autosaves.
** If you die and aren't playing on [[PermaDeath Hardcore]], you're warped back to the last habitat you visited. If that death also involved the destruction of your vehicle, and your last habitat happens to be situated too deep to reach the surface by swimming and you don't have any resources close enough to build a new vehicle, you're stuck there.
** It's quite easy to underestimate the time it can take to navigate the game's labyrinthine tunnel systems. Fail to pack enough spare power cells for your vehicle, or enough batteries for your repair tool, and you can find yourself in the same situation as above very suddenly. The loss of your vehicle at great depths in general is an almost certain death sentence even if you initially survived its destruction.
** You may also simply die of thirst or starvation on such excursions. The latter can usually be staved off by catching some edible fish, but if you don't have the Thermoblade (which cooks any small edible fish on contact), eating them raw seriously lowers your hydration, so you're dead anyway. Always make sure you have a healthy supply of food and especially water before you head out.
** Until [[spoiler:you reach the Primary Containment Facility]], ion cubes are a strictly limited resource with only a handful of samples to be found in the game world. If you spend too many of them building the wrong stuff, you may lock yourself out of the final levels, making it impossible to finish the game.
*** Averted in that there are actually sufficient 'keys' [[spoiler:a.k.a Purple Tablets]] hidden in the world to access the [[spoiler:Alien Thermal Plant]] even if you visit every other location. The only problem is finding them first.
* WellIntentionedExtremist: [[spoiler:The Precursors. They were the ones responsible for shooting down the ''Aurora'' and ''Degasi'', and later the ''Sunbeam'' that lands to try and rescue you in front of your own eyes. However, there's a reason they're doing all of this. A [[ThePlague bacterial epidemic]] ravages the planet, which has infected enough creatures to become the norm. The Precursors want to cleanse the planet of the bacterium... by killing all those with it. In desperation, they built the surface-to-orbit oversized cannon, euphemistically called the Quarantine Enforcement Platform, and wound up killing a bunch of Sea Emperors - ''note the plural; 314 to be exact'' - trying to find a cure. They also created the Warpers]].
* WorthlessYellowRocks: Played with. Gold is one of the two resources that play a special sound every time you pick a piece up. It is also the only resource found in three of the five available harvest nodes (Sandstone, Basalt and Shale). While there are some uses for gold, its first two harvest node colleagues, silver and lithium, are more sought after as they're used in recipes more crucial to survival. [[labelnote:Explanation]]Silver is used to make Computer Chips, which are a key ingredient in nearly every Tool, Upgrade Module and other technologies. Lithium is used to make Plasteel (used in Cyclops/Prawn construction and Depth upgrade modules) and Base Reinforcements (essential for any expansions made to a seabase).[[/labelnote]] Averted in the Silent Running update, which changed the recipe for the Computer Chip to accept Gold instead of Silver.



* VillainTeleportation: Well, Threatening Force Teleportation, anyway. Warpers are {{Cyborg}}s with built-in teleportation hardware. They can come and go as they please. Not only that, but they can teleport you out of your vehicle so they can attack you directly, and warp hostile fauna in on top of you.
* ViolationOfCommonSense:
** The Prawn Suit's grappling hook is meant for helping it traverse vertical distances easily and quickly, but despite the "magnetic" part in its description it can latch on to almost anything. Even Leviathans. There's no benefit in doing so, considering the beast can still fully attack the Prawn, except for the sheer badass factor of playing rodeo with a 50-meters murder machine.
** In a similar vein, Leviathans can be scanned like any other creature. Needless to say that attempting this even with the help of a Stasis Rifle is extremely dangerous, very likely to get you killed, and ultimately useless because creature scans don't actually do anything beneficial. At least your PDA lampshades it by congratulating you in case you do manage to pull it off.
** Ion cubes are strange, glowy green artificial crystals the size of a human head that contain as much energy as a tactical nuclear warhead each. Like most mineral-like resources, ion cubes may be found in large deposits, which you can mine by shoving a huge honkin' Prawn grinder drill into the ominously glowing six-foot cluster. Nothing bad happens, but man, there's gotta be a more subtle approach to this sort of business.
* VolcanoLair: The Lava Castle, a massive [[ExactlyWhatItSaysOnTheTin castle-like rock formation located deep within the Inactive Lava Zone]]. [[spoiler:It's home to the Precursors, along with the Lava Lakes directly below it. All of their power comes from the Alien Thermal Plant at the heart of the Castle, and is budgeted into various operations]].
* WalkDontSwim: As far as creatures go, Cave Crawlers, Blood Crawlers, and Sea Treaders. The player is capable of this too when controlling the PRAWN suit.
* WeaponOfMassDestruction: The ion crystals you find all have the power of a thermonuclear detonation. Subverted in that they are so stable that you would have to take a lot of steps to set them off.
** [[spoiler:Yet this is played very straight with a small, grenade-sized weapon you can find in the Quarantine Enforcement Platform. Presumably constructed in the event of quarantine failure, its energy potential isn't just enough to wipe out the base or the entirety of the local biomes, but the entire planet alongside most of the solar system to boot]].
* WeHardlyKnewYe: [[spoiler:Every single human and the precursors qualify, but Captain Avery Quinn takes the cake]].
* TheWorfEffect: Reaper Leviathans are highly dangerous early in the game. [[spoiler:In and around The Lava Zones are Reaper skeletons that the Sea Dragon left behind after ''eating them''.]]
* TheWorldIsJustAwesome:
** Bart Torgal certainly thinks so, as he articulates in a log aptly titled "This World":
--->''"I thought it might get claustrophobic, living underwater. [[{{Jerkass}} Father]] feels it is. He'd tell me it was childish, but I stare out the window and sometimes I think how lucky I am to see this world up close. Back on the island I wouldn't have believed the creatures that live down here. The fish, they ''[[BioluminescenceIsCool glow]]''... there's one that's 90% eyeball... Snakes twice the length of a habitat compartment..."''
** The player can also invoke this by building an observatory (which the PDA complains is "imprudent for survival purposes") and using it to bask in the beauty of 4546B. There's even a special musical track that plays whenever the player enters it.
* YankTheDogsChain: After everything the survivor goes through, from scavenging for food and water, to fending off giant predators, to [[spoiler: curing a disease that has plagued the planet for over a thousand years]], he finally builds a rocket and escapes, only for [[spoiler: Alterra to claim that he owes them one trillion credits for all the resources he scavenged, and they won't grant him permission to land until he pays it. Hope you can barter off all the information gathered from scanning the items in 4546B, as well as brought Precursor tech back to barter off, and even that might not work, since Alterra preemptively claimed everything on the planet was their property to begin with.]]
* YouShouldntKnowThisAlready: Mostly averted due to the game's open world and non-linear plot progression.
** Code-locked doors always require the same passcode to unlock, and if you happen to know the combination from a guide or a previous playthrough, you can open them without having found the information in-game before.
** You can investigate plot-critical locations and perform plot-critical tasks without having been given the order via radio or PDA. The story doesn't have a truly fixed linear narrative, so you can complete its objectives in almost any order, although several of them still require specific equipment to become accessible. Knowing the entrance to the Lava Lakes won't help you much without a heavily upgraded Prawn or Cyclops to actually get you there.
** While fragments of basic gear like the Seaglide, the laser cutter, beacons and so on are semi-randomly distributed across the minor wrecks, the large ones always provide the same salvage, and important stuff like Prawn or Cyclops parts can always be found at the exact same locations. You know the spots? Go and get 'em at any time.




[[folder:Unsorted]]
* UnexpectedlyRealisticGameplay:
** It's not obvious from the start that oxygen tanks actually store oxygen rather than merely increasing your cap. If you have several in your inventory, each has its own supply and can be swapped out as the equipped one depletes. Similarly, each individual tank must be refilled with air by equipping them.
** Also applies to the game as a whole. The vast majority of contemporary survival games have tutorials, quests, map markers (not to mention a map in the first place), a more or less strict narrative with a clear ultimate goal, and so on. ''Subnautica'''s total lack of any hand-holding can be baffling to new players until they switch their standard video-gaming expectations back to common sense and think about what anyone who's stranded in uncharted territory would do: survive the first day, come up with a plan to get the hell out of there, and then survive long enough to figure out how to do just that.
* UnderTheSea: Almost the entire game takes place in the ocean, with [[spoiler:a couple of islands]] and the non-submerged half of the ''Aurora'' being the only exceptions.
* UnderwaterBase: You can make these using the Habitat Builder and raw materials such as titanium and glass.
* UnstableEquilibrium: The beginning of the game is almost exclusively about basic survival: getting food and water to stay alive long enough to get equipment to survive the planet's dangers. Obtaining the means to farm your food is a huge step in freeing up time to spend on exploration, but certainly isn't the only boost forward.
* UnwinnableByMistake: There are a number of ways to get yourself stuck in the deep sea with no way to continue the game, exacerbated by there only being one single savegame per campaign and no autosaves.
** If you die and aren't playing on [[PermaDeath Hardcore]], you're warped back to the last habitat you visited. If that death also involved the destruction of your vehicle, and your last habitat happens to be situated too deep to reach the surface by swimming and you don't have any resources close enough to build a new vehicle, you're stuck there.
** It's quite easy to underestimate the time it can take to navigate the game's labyrinthine tunnel systems. Fail to pack enough spare power cells for your vehicle, or enough batteries for your repair tool, and you can find yourself in the same situation as above very suddenly. The loss of your vehicle at great depths in general is an almost certain death sentence even if you initially survived its destruction.
** You may also simply die of thirst or starvation on such excursions. The latter can usually be staved off by catching some edible fish, but if you don't have the Thermoblade (which cooks any small edible fish on contact), eating them raw seriously lowers your hydration, so you're dead anyway. Always make sure you have a healthy supply of food and especially water before you head out.
** Until [[spoiler:you reach the Primary Containment Facility]], ion cubes are a strictly limited resource with only a handful of samples to be found in the game world. If you spend too many of them building the wrong stuff, you may lock yourself out of the final levels, making it impossible to finish the game.
*** Averted in that there are actually sufficient 'keys' [[spoiler:a.k.a Purple Tablets]] hidden in the world to access the [[spoiler:Alien Thermal Plant]] even if you visit every other location. The only problem is finding them first.
* VillainTeleportation: Well, Threatening Force Teleportation, anyway. [[spoiler:Warpers]] are cyborgs with built-in teleportation hardware. They can come and go as they please. Not only that, but they can teleport you out of your vehicle so they can attack you directly, and warp hostile fauna in on top of you.
* ViolationOfCommonSense
** The Prawn Suit's grappling hook is meant for helping it traverse vertical distances easily and quickly, but despite the "magnetic" part in its description it can latch on to almost anything. Even Leviathans. There's no benefit in doing so, considering the beast can still fully attack the Prawn, except for the sheer badass factor of playing rodeo with a 50-meters murder machine.
** In a similar vein, Leviathans can be scanned like any other creature. Needless to say that attempting this even with the help of a Stasis Rifle is extremely dangerous, very likely to get you killed, and ultimately useless because creature scans don't actually do anything beneficial. At least your PDA lampshades it by congratulating you in case you do manage to pull it off.
** Ion cubes are strange, glowy green artificial crystals the size of a human head that contain as much energy as a tactical nuclear warhead each. Like most mineral-like resources, ion cubes may be found in large deposits, which you can mine by shoving a huge honkin' Prawn grinder drill into the ominously glowing six-foot cluster. Nothing bad happens, but man, there's gotta be a more subtle approach to this sort of business.
* VolcanoLair: The Lava Castle, a massive [[ExactlyWhatItSaysOnTheTin castle-like rock formation located deep within the Inactive Lava Zone.]] [[spoiler:It's home to the Precursors, along with the Lava Lakes directly below it. All of their power comes from the Alien Thermal Plant at the heart of the Castle, and is budgeted into various operations.]]
* WalkDontSwim: As far as creatures go, Cave Crawlers, Blood Crawlers, and Sea Treaders. The player is capable of this too when controlling the PRAWN suit.
* WeaponOfMassDestruction: The ion crystals you find all have the power of a thermonuclear detonation. Subverted in that they are so stable that you would have to take a lot of steps to set them off.
** [[spoiler:Yet this is played very straight with a small, grenade-sized weapon you can find in the Quarantine Enforcement Platform. Presumably constructed in the event of quarantine failure, its energy potential isn't just enough to wipe out the base or the entirety of the local biomes, but the entire planet alongside most of the solar system to boot.]]
* WeHardlyKnewYe: [[spoiler:Every single human and the precursors qualify, but Captain Avery Quinn takes the cake.]]
* WellIntentionedExtremist: [[spoiler:The Precursors. They were the ones responsible for shooting down the ''Aurora'' and ''Degasi'', and later the ''Sunbeam'' that lands to try and rescue you in front of your own eyes. However, there's a reason they're doing all of this. A [[ThePlague bacterial epidemic]] ravages the planet, which has infected enough creatures to become the norm. The Precursors want to cleanse the planet of the bacterium... by killing all those with it. In desperation, they built the surface-to-orbit oversized cannon, euphemistically called the Quarantine Enforcement Platform, and wound up killing a bunch of Sea Emperors - ''note the plural; 314 to be exact'' - trying to find a cure. They also created the Warpers.]]
* TheWorfEffect: Reaper Leviathans are highly dangerous early in the game. [[spoiler:In and around The Lava Zones are Reaper skeletons that the Sea Dragon left behind after ''eating them''.]]
* TheWorldIsJustAwesome:
** Bart Torgal certainly thinks so, as he articulates in a log aptly titled "This World":
--->''"I thought it might get claustrophobic, living underwater. [[{{Jerkass}} Father]] feels it is. He'd tell me it was childish, but I stare out the window and sometimes I think how lucky I am to see this world up close. Back on the island I wouldn't have believed the creatures that live down here. The fish, they ''[[BioluminescenceIsCool glow]]''... there's one that's 90% eyeball... Snakes twice the length of a habitat compartment..."''
** The player can also invoke this by building an observatory (which the PDA complains is "imprudent for survival purposes") and using it to bask in the beauty of 4546B. There's even a special musical track that plays whenever the player enters it.
* WorthlessYellowRocks: Played with. Gold is one of the two resources that play a special sound every time you pick a piece up. It is also the only resource found in three of the five available harvest nodes (Sandstone, Basalt and Shale). While there are some uses for gold, its first two harvest node colleagues, silver and lithium, are more sought after as they're used in recipes more crucial to survival. [[labelnote:Explanation]]Silver is used to make Computer Chips, which are a key ingredient in nearly every Tool, Upgrade Module and other technologies. Lithium is used to make Plasteel (used in Cyclops/Prawn construction and Depth upgrade modules) and Base Reinforcements (essential for any expansions made to a seabase).[[/labelnote]] Averted in the Silent Running update, which changed the recipe for the Computer Chip to accept Gold instead of Silver.
* YankTheDogsChain: After everything the survivor goes through, from scavenging for food and water, to fending off giant predators, to [[spoiler: curing a disease that has plagued the planet for over a thousand years]], he finally builds a rocket and escapes, only for [[spoiler: Alterra to claim that he owes them one trillion credits for all the resources he scavenged, and they won't grant him permission to land until he pays it. Hope you can barter off all the information gathered from scanning the items in 4546B, as well as brought Precursor tech back to barter off, and even that might not work, since Alterra preemptively claimed everything on the planet was their property to begin with.]]
* YouShouldntKnowThisAlready: Mostly averted due to the game's open world and non-linear plot progression.
** Code-locked doors always require the same passcode to unlock, and if you happen to know the combination from a guide or a previous playthrough, you can open them without having found the information in-game before.
** You can investigate plot-critical locations and perform plot-critical tasks without having been given the order via radio or PDA. The story doesn't have a truly fixed linear narrative, so you can complete its objectives in almost any order, although several of them still require specific equipment to become accessible. Knowing the entrance to the Lava Lakes won't help you much without a heavily upgraded Prawn or Cyclops to actually get you there.
** While fragments of basic gear like the Seaglide, the laser cutter, beacons and so on are semi-randomly distributed across the minor wrecks, the large ones always provide the same salvage, and important stuff like Prawn or Cyclops parts can always be found at the exact same locations. You know the spots? Go and get 'em at any time.
[[/folder]]


* PatchworkMap: Complete with LawOfCartographicalElegance.
* PermanentlyMissableContent: Several PDA entries, particularly those related to plot-critical events [[spoiler:Especially those involving the infection's progress through the protagonist and the clues to finding certain alien locations downloaded from the QEP]], become unavailable once you progress/skip past them and/or ignore the cues to scan yourself. This can be particularly frustrating for those looking to collect every PDA entry in one playthrough.
** Can also be an issue for those looking to scan all the species in the game. A bug sometimes causes Bladderfish to stop spawning in the Safe Shallows, and through simple attrition their numbers will eventually whittle away to nothing, preventing players from ever scanning them if they failed to do so at the start of the game.
* PrimalFear: You're in the depths of the ocean on an alien planet. Nothing is familiar; the silhouettes in the distance could be harmless or deadly, and you're never given any reliable weapons with which to fight back against the unknown. In the pitch-black night, you'll never know for sure if anything is sneaking up behind you for a quick bite...
* PureEnergy: Any exterior power source (and power transmitters) transmit the energy to the nearest base not by cables, but by a beam of sorts.
* RegeneratingHealth: Your health recovers slowly but surely. It's more reliable when your hunger meter is above 100 (it goes [[UpToEleven to 120-130 at most]]).
* RespawningEnemies: The creatures of Planet 4546B eventually respawn. As of the full release, however, medium to large creatures no longer respawn, meaning it is possible to KillEmAll. Yes, this includes most Leviathans.
* RidiculouslyFastConstruction: Alterra's fabricator technology can construct virtually anything in a matter of seconds, assuming the user provides the blueprints and the required materials. It can even build [[spoiler:the Neptune, a huge single-stage interorbital rocket,]] in less than three minutes.
* RoboSpeak: Averted by the [=AIs=] that manage your bases and vehicles, but played straight by the escape pods' automated distress signal transponders.
* SaltSolution:
** Salt is needed to preserve dead fish or they'll go bad very quickly. It is also used as an ingredient to create bleach for disinfecting water, and it's needed for a number of vehicle upgrades.
** Salt can also prove hazardous to your health. The brine rivers and lakes in the Lost River biome are so highly concentrated that touching them without a Prawn Suit is akin to getting doused in acid, dealing high damage in very short ticks.
* SceneryPorn: The game's main selling point - the designers worked very meticulously to invoke this trope, and the result truly must be seen to be believed.
* SeaMonster: Plenty fulfill the classic tropes -- giant squids, Krakens, and Leviathans galore, in addition to exotic but "normal-sized" sharks. The Crater's Edge (formerly known as the Void) surrounding the playzone used to host an onslaught of dangerous fauna to discourage players from venturing too far without resorting to an InvisibleWall or WrapAround, but as of the full release the game jumps directly to spawning adult ''Ghost Leviathans'' to chase the player until they escape the area and cause them to despawn.
* SharedUniverse: With ''VideoGame/NaturalSelection2'', also made by Unknown Worlds. Originally the name of the Alterra corporation on the Knife's blade was considered merely an easter egg, until [[spoiler:a log file coded with a Caesar cipher and ASCII on the Habitat Update’s promotional webpage mentions “the Kharaa conflict," and [[http://subnautica.wikia.com/wiki/Kharaa_Bacterium#Trivia as the game's wiki notes]], the Kharaa are, in fact, connected with the Kharaa Bacterium in some fashion.]] [[note]]The current line is that the Kharaa in each game are simply different manifestations of the same bacterial life form, owing to the radically different environments in which they're found and possibly due to the Precursors meddling with the strain found on 4546B.[[/note]]
* ShownTheirWork: Before lead became a resource to find as any other (Machinery update), it was manufactured by combining copper and silver ores. This reflects the fact that lead can be found in ores of other metals, such as Galena (an ore of silver). However, for a while lead used to be manufactured from [[ArtisticLicense two batteries]].



* SoundCodedForYourConvenience: All the wildlife is quite noisy, and makes unique sounds to boot. Learning which creatures make which sounds lets you know when it's just a big Reefback saying hi and when you're about to be EatenAlive.
* SpaceIsolationHorror: The game leaves you stranded on an [[SingleBiomePlanet ocean planet]] full of large, terrifying sea monsters who want to eat you.
* SprintShoes: The basic underwater variant are a pair of silicone flippers, which slightly increase the player character's baseline swimming speed and can be upgraded into Ultra Glide Fins. The straighter variant though is the Seaglide, which is a fancy [[https://en.wikipedia.org/wiki/Diver_propulsion_vehicle DPV]], or a propeller with handles. It comes with a local topography map and flashlight. It's also able to be recharged indefinitely with Swim Charge Fins (which may or may not change in future updates), but only when the topo map and flashlight are switched off.
* StatDeath: Running out of oxygen won't do anything to your health bar, but you'll die anyway if you don't reach an oxygen-rich environment soon.
* SuperPersistentPredator: Largely {{averted|Trope}}. Most predators will tend to avoid the player character unless an opportunity presents itself, and even then will tend to give up the chase if the player character can outrun them or proves themselves capable of hurting the predator (a good knife wound will often send the predator swimming away as fast as its fins can propel it.) On the whole, they tend to prefer easy prey. The closest thing that comes to playing this straight are the Reaper Leviathans, which seem to be apex predators. If one spots you, ''run''. '''''Run and don't look back.''''' Or, seeing as it can [[LightningBruiser outrun your Seamoth and also tear it to shreds in seconds]], [[YouAreAlreadyDead don't bother]].
** That said, the Seamoth Perimeter Defense system allows you a quick zap to minimize hull damage that will send Reapers the other way, or a longer charged-up one that can outright kill smaller predators (including bone sharks). However, Reaper, Ghost and Sea Dragon Leviathans won't be discouraged for long by the shock.
** They also won't be distracted for long by Creature Decoys which can be hand dropped or launched by the Cyclops. Hell, even being scooped up in a PRAWN suit and using the drill arm(s) to fight back won't make a Reaper let go of you, to say nothing of the other two mean beasties.
** Though a risky venture, Reaper Leviathans will gladly take any fish you have on hand and leave you alone for a short while, giving you enough time to escape.
** The single most reliable way to evade them is judicious application of a Stasis rifle or a Vortex torpedo, which are capable of paralyzing a Leviathan for several precious seconds while you try to flee.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
* LilyPadPlatform: Subverted. There ''is'' a lilypad biome, but you can't walk on them without falling through.
[[/folder]]

[[folder:Unsorted]]
* PatchworkMap: Complete with LawOfCartographicalElegance.



* PermanentlyMissableContent: Several PDA entries, particularly those related to plot-critical events [[spoiler:Especially those involving the infection's progress through the protagonist and the clues to finding certain alien locations downloaded from the QEP]], become unavailable once you progress/skip past them and/or ignore the cues to scan yourself. This can be particularly frustrating for those looking to collect every PDA entry in one playthrough.
** Can also be an issue for those looking to scan all the species in the game. A bug sometimes causes Bladderfish to stop spawning in the Safe Shallows, and through simple attrition their numbers will eventually whittle away to nothing, preventing players from ever scanning them if they failed to do so at the start of the game.
* PiranhaProblem: Biters, which hunt in small schools and chase you from further away if your health is low.
* PointyHairedBoss: The CEO of the Alterra division overseeing 4546B operations. He contacts Robin through her branch supervisor (her sister) to chew her out for the mess taking place on the planet. Even though none of what happened is Robin's fault, he refuses to let her speak, even telling her to shut up after supposedly asking her a whole series of direct questions. At the end he leaves the room before she can even begin to explain the situation.

to:

* PermanentlyMissableContent: Several PDA entries, particularly those related to plot-critical events [[spoiler:Especially those involving the infection's progress through the protagonist and the clues to finding certain alien locations downloaded from the QEP]], become unavailable once you progress/skip past them and/or ignore the cues to scan yourself. This can be particularly frustrating for those looking to collect every PDA entry in one playthrough.
** Can also be an issue for those looking to scan all the species in the game. A bug sometimes causes Bladderfish to stop spawning in the Safe Shallows, and through simple attrition their numbers will eventually whittle away to nothing, preventing players from ever scanning them if they failed to do so at the start of the game.
* PiranhaProblem: Biters, Biters and Blighters, which hunt in small schools and chase you from further away if your health is low.
* PointyHairedBoss: The CEO of the Alterra division overseeing 4546B operations. He contacts Robin through her branch supervisor (her sister) to chew her out for the mess taking place on the planet. Even though none of what happened is Robin's fault, he refuses to let her speak, even telling her to shut up after supposedly asking her a whole series of direct questions. At the end he leaves the room before she can even begin to explain the situation.
low.



* PowerCrystal

to:

* PowerCrystalPowerCrystal:



* PrimalFear: You're in the depths of the ocean on an alien planet. Nothing is familiar; the silhouettes in the distance could be harmless or deadly, and you're never given any reliable weapons with which to fight back against the unknown. In the pitch-black night, you'll never know for sure if anything is sneaking up behind you for a quick bite...
* PureEnergy: Any exterior power source (and power transmitters) transmit the energy to the nearest base not by cables, but by a beam of sorts.



* RegeneratingHealth: Your health recovers slowly but surely.
** It's more reliable when your hunger meter is above 100 (it goes [[UpToEleven to 120-130 at most]]).
* RespawningEnemies: The creatures of Planet 4546B eventually respawn. As of the full release, however, medium to large creatures no longer respawn, meaning it is possible to KillEmAll. Yes, this includes most Leviathans.



* RidiculouslyFastConstruction: Alterra's fabricator technology can construct virtually anything in a matter of seconds, assuming the user provides the blueprints and the required materials. It can even build [[spoiler:the Neptune, a huge single-stage interorbital rocket,]] in less than three minutes.
* RoboSpeak: Averted by the [=AIs=] that manage your bases and vehicles, but played straight by the escape pods' automated distress signal transponders.
* SaltSolution:
** Salt is needed to preserve dead fish or they'll go bad very quickly. It is also used as an ingredient to create bleach for disinfecting water, and it's needed for a number of vehicle upgrades.
** Salt can also prove hazardous to your health. The brine rivers and lakes in the Lost River biome are so highly concentrated that touching them without a Prawn Suit is akin to getting doused in acid, dealing high damage in very short ticks.



* SceneryPorn: The game's main selling point - the designers worked very meticulously to invoke this trope, and the result truly must be seen to be believed.



* SeaMonster: Plenty fulfill the classic tropes -- giant squids, Krakens, and Leviathans galore, in addition to exotic but "normal-sized" sharks. The Crater's Edge (formerly known as the Void) surrounding the playzone used to host an onslaught of dangerous fauna to discourage players from venturing too far without resorting to an InvisibleWall or WrapAround, but as of the full release the game jumps directly to spawning adult ''Ghost Leviathans'' to chase the player until they escape the area and cause them to despawn.
* SendInTheSearchTeam: What the ''Aurora'' is to the ''Degasi'' and the ''Sunbeam'' to the ''Aurora''.

to:

* SeaMonster: Plenty fulfill the classic tropes -- giant squids, Krakens, and Leviathans galore, in addition to exotic but "normal-sized" sharks. The Crater's Edge (formerly known as the Void) surrounding the playzone used to host an onslaught of dangerous fauna to discourage players from venturing too far without resorting to an InvisibleWall or WrapAround, but as of the full release the game jumps directly to spawning adult ''Ghost Leviathans'' to chase the player until they escape the area and cause them to despawn.
* SendInTheSearchTeam: What the ''Aurora'' is to the ''Degasi'' and the ''Sunbeam'' to the ''Aurora''.''Aurora''. [[spoiler:It's later revealed that the ''Aurora'' was itself this to the ''Degasi'', albeit as a secondary mission]].



* SequenceBreaking: Nothing forces you to repair the radio in Lifepod 5, and it's entirely possible to play through the game without the numerous hints you normally get by listening to the frequent radio calls. However, doing so results in missing several key events and important plot points, like [[spoiler:the ''Sunbeam'' getting shot down by the Quarantine Enforcement Platform, or receiving the code for the ''Aurora'' cabin containing the Neptune blueprints]]. Once you repair the radio or build a new one, all the messages you missed will still be received one after the other, only with a lot less context and even less actual use to you. [[spoiler: However, not getting the Sunbeam event until after you've cured the planet of the Kharaa virus and disabled the quarantine platform gun would result in a happier ending since they won't be shot down and killed by the quarantine platform canon, only refusing to rescue you due to the debris field in the way.]]
* SharedUniverse: With ''VideoGame/NaturalSelection2'', also made by Unknown Worlds. Originally the name of the Alterra corporation on the Knife's blade was considered merely an easter egg, until [[spoiler:a log file coded with a Caesar cipher and ASCII on the Habitat Update’s promotional webpage mentions “the Kharaa conflict," and [[http://subnautica.wikia.com/wiki/Kharaa_Bacterium#Trivia as the game's wiki notes]], the Kharaa are, in fact, connected with the Kharaa Bacterium in some fashion.]] [[note]]The current line is that the Kharaa in each game are simply different manifestations of the same bacterial life form, owing to the radically different environments in which they're found and possibly due to the Precursors meddling with the strain found on 4546B.[[/note]]

to:

* SequenceBreaking: Nothing forces you to repair the radio in Lifepod 5, and it's entirely possible to play through the game without the numerous hints you normally get by listening to the frequent radio calls. However, doing so results in missing several key events and important plot points, like [[spoiler:the ''Sunbeam'' getting shot down by the Quarantine Enforcement Platform, or receiving the code for the ''Aurora'' cabin containing the Neptune blueprints]]. Once you repair the radio or build a new one, all the messages you missed will still be received one after the other, only with a lot less context and even less actual use to you. [[spoiler: However, not getting the Sunbeam event until after you've cured the planet of the Kharaa virus and disabled the quarantine platform gun would result in a happier ending since they won't be shot down and killed by the quarantine platform canon, only refusing to rescue you due to the debris field in the way.]]
* SharedUniverse: With ''VideoGame/NaturalSelection2'', also made by Unknown Worlds. Originally the name of the Alterra corporation on the Knife's blade was considered merely an easter egg, until [[spoiler:a log file coded with a Caesar cipher and ASCII on the Habitat Update’s promotional webpage mentions “the Kharaa conflict," and [[http://subnautica.wikia.com/wiki/Kharaa_Bacterium#Trivia as the game's wiki notes]], the Kharaa are, in fact, connected with the Kharaa Bacterium in some fashion.]] [[note]]The current line is that the Kharaa in each game are simply different manifestations of the same bacterial life form, owing to the radically different environments in which they're found and possibly due to the Precursors meddling with the strain found on 4546B.[[/note]]
way]].



* ShownTheirWork: Before lead became a resource to find as any other (Machinery update), it was manufactured by combining copper and silver ores. This reflects the fact that lead can be found in ores of other metals, such as Galena (an ore of silver). However, for a while lead used to be manufactured from [[ArtisticLicense two batteries]].



* SomethingCompletelyDifferent: The entire game takes place in the ocean, except for your life pod, [[spoiler:the crashed ''Aurora'', a floating island, a true island, and a Lilypad Biome yet to be implemented.]]
* SoundCodedForYourConvenience: All the wildlife is quite noisy, and makes unique sounds to boot. Learning which creatures make which sounds lets you know when it's just a big Reefback saying hi and when you're about to be eaten alive.

to:

* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
* SomethingCompletelyDifferent: The entire game takes place in the ocean, except for your life pod, [[spoiler:the crashed ''Aurora'', a floating island, and a true island, and a Lilypad Biome yet to be implemented.]]
* SoundCodedForYourConvenience: All the wildlife is quite noisy, and makes unique sounds to boot. Learning which creatures make which sounds lets you know when it's just a big Reefback saying hi and when you're about to be eaten alive.
island]].



* SpaceIsolationHorror: The game leaves you stranded on an [[SingleBiomePlanet ocean planet]] full of large, terrifying sea monsters who want to eat you.



* SprintShoes: The basic underwater variant are a pair of silicone flippers, which slightly increase the player character's baseline swimming speed and can be upgraded into Ultra Glide Fins. The straighter variant though is the Seaglide, which is a fancy [[https://en.wikipedia.org/wiki/Diver_propulsion_vehicle DPV]], or a propeller with handles. It comes with a local topography map and flashlight. It's also able to be recharged indefinitely with Swim Charge Fins (which may or may not change in future updates), but only when the topo map and flashlight are switched off.



* StatDeath: Running out of oxygen won't do anything to your health bar, but you'll die anyway if you don't reach an oxygen-rich environment soon.
* SubStory: The Cyclops in particular. SilentRunningMode is coming up.
* SuperPersistentPredator: Largely {{averted|Trope}}. Most predators will tend to avoid the player character unless an opportunity presents itself, and even then will tend to give up the chase if the player character can outrun them or proves themselves capable of hurting the predator (a good knife wound will often send the predator swimming away as fast as its fins can propel it.) On the whole, they tend to prefer easy prey. The closest thing that comes to playing this straight are the Reaper Leviathans, which seem to be apex predators. If one spots you, ''run''. '''''Run and don't look back.''''' Or, seeing as it can [[LightningBruiser outrun your Seamoth and also tear it to shreds in seconds]], [[YouAreAlreadyDead don't bother]].
** That said, the Seamoth Perimeter Defense system allows you a quick zap to minimize hull damage that will send Reapers the other way, or a longer charged-up one that can outright kill smaller predators (including bone sharks). However, Reaper, Ghost and Sea Dragon Leviathans won't be discouraged for long by the shock.
** They also won't be distracted for long by Creature Decoys which can be hand dropped or launched by the Cyclops. Hell, even being scooped up in a PRAWN suit and using the drill arm(s) to fight back won't make a Reaper let go of you, to say nothing of the other two mean beasties.
** Though a risky venture, Reaper Leviathans will gladly take any fish you have on hand and leave you alone for a short while, giving you enough time to escape.
** The single most reliable way to evade them is judicious application of a Stasis rifle or a Vortex torpedo, which are capable of paralyzing a Leviathan for several precious seconds while you try to flee.
* SwallowedWhole: What happens after the aforementioned Reaper Leviathan catches you. Also one of the ways the Sea Dragon Leviathan can seal your doom, if it doesn't roast you with its fire breath.

to:

* StatDeath: Running out of oxygen won't do anything to your health bar, but you'll die anyway if you don't reach an oxygen-rich environment soon.
* SubStory: The Cyclops in particular. SilentRunningMode is coming up.
* SuperPersistentPredator: Largely {{averted|Trope}}. Most predators will tend to avoid the player character unless an opportunity presents itself, and even then will tend to give up the chase if the player character can outrun them or proves themselves capable of hurting the predator (a good knife wound will often send the predator swimming away as fast as its fins can propel it.) On the whole, they tend to prefer easy prey. The closest thing that comes to playing this straight are the Reaper Leviathans, which seem to be apex predators. If one spots you, ''run''. '''''Run and don't look back.''''' Or, seeing as it can [[LightningBruiser outrun your Seamoth and also tear it to shreds in seconds]], [[YouAreAlreadyDead don't bother]].
** That said, the Seamoth Perimeter Defense system allows you a quick zap to minimize hull damage that will send Reapers the other way, or a longer charged-up one that can outright kill smaller predators (including bone sharks). However, Reaper, Ghost and Sea Dragon Leviathans won't be discouraged for long by the shock.
** They also won't be distracted for long by Creature Decoys which can be hand dropped or launched by the Cyclops. Hell, even being scooped up in a PRAWN suit and using the drill arm(s) to fight back won't make a Reaper let go of you, to say nothing of the other two mean beasties.
** Though a risky venture, Reaper Leviathans will gladly take any fish you have on hand and leave you alone for a short while, giving you enough time to escape.
** The single most reliable way to evade them is judicious application of a Stasis rifle or a Vortex torpedo, which are capable of paralyzing a Leviathan for several precious seconds while you try to flee.
particular.
* SwallowedWhole: What happens after the aforementioned Reaper Leviathan catches you.you with less than 80 health. Also one of the ways the Sea Dragon Leviathan can seal your doom, if it doesn't roast you with its fire breath.



* TakeYourTime: The game very heavily implies that you will die after about five weeks, thanks to [[spoiler:exposure to the Kharaa bacterium]] and that symptoms should start appearing around two weeks in. Instead, the disease's progression is entirely event-based, and the player will never fatally succumb to it. [[spoiler:Slightly justified, thanks to the presence of Peepers spreading diluted Enzyme 42, which inhibits the bacterium's growth and progression. For the same reason the Kharaa hasn't wiped out the entire biosphere, it's possible Ryley is kept alive via indirect exposure.]]

to:

* TakeYourTime: The game very heavily implies that you will die after about five weeks, thanks to [[spoiler:exposure to the Kharaa bacterium]] and that symptoms should start appearing around two weeks in. Instead, the disease's progression is entirely event-based, and the player will never fatally succumb to it. [[spoiler:Slightly justified, thanks to the presence of Peepers spreading diluted Enzyme 42, which inhibits the bacterium's growth and progression. For the same reason the Kharaa hasn't wiped out the entire biosphere, it's possible Ryley is kept alive via indirect exposure.]]exposure]].


Added DiffLines:

[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The Rock Puncher, and the scrapped Grabcrab.
* LilyPadPlatform: Subverted. There ''is'' a lilypad biome, but you can't walk on them without falling through.
* PointyHairedBoss: The CEO of the Alterra division overseeing 4546B operations. He contacts Robin through her branch supervisor (her sister) to chew her out for the mess taking place on the planet. Even though none of what happened is Robin's fault, he refuses to let her speak, even telling her to shut up after supposedly asking her a whole series of direct questions. At the end he leaves the room before she can even begin to explain the situation.
[[/folder]]

[[folder:Unsorted]]


* MadeOfIron: Most hostile fauna counts. It's extremely difficult to outright kill anything larger than a cat. Even the Prawn Suit's giant drill arm will merely chase off attacking predators like Bone Sharks for a short while; you can drill into one for a full minute or more without the beast dying, and that's next to impossible to pull off anyway without glitches because all predators are much faster than the Prawn. You need to get really creative if you want something dead.
* MeaningfulName: Invoked, since your PDA is generating names for creatures as you encounter them, so almost all of them have names directly tied to their distinctive traits. In fact, the Reginald actually sticks out as being the ''only'' fauna that doesn't have such a name.
* MegaCorp: The 37 "trans-gov" corporations that control the galaxy. Two matter in the game: The Alterra Corporation that owns the ''Aurora'' and makes just about everything seen, and the Mongolian Empire that owns the ''Degasi''. A "trans-gov" is legally defined in-universe as any entity, corporate or state, which claims ownership of at least one planet and one phase gate under the terms of The Charter. There are a few actual governments in their ranks, but most are implied to be full-blown {{Mega Corp}}s.
* MeleeATrois: Different species of hostile creatures tend to dislike each other just as much as the player, and will often fight if they happen to be in the same vicinity. In particular, many creatures will automatically attack any warpers that happen to enter their territory.
* MixAndMatchCritter: Some of the creatures have elements of two or more creatures. The Crabsquid is an octopus with Japanese Spider Crab legs and claws. The Sea Dragon Leviathan is a crocodilian with squid tentacles for its lower half, and the Emperor Leviathan is similar but with an insectoid/crustacean head.
* MorePredatorsThanPrey: The dev team works hard to avert this one: sure, there are some big, scary fish in the sea, but there are also lots of little, less scary fish.
* NatureIsNotNice: Most of the predators don't deliberately seek ''you'' out; you just happen to be snack-sized and in the vicinity. They'll just as happily eat small fish. Likewise, the greatest threat in survival mode isn't necessarily the wildlife itself; it's running out of food and water,[[note]]at least until you get a habitat with a fish tank and farm areas built,[[/note]] or running out of oxygen while looking for resources.
* NoBiochemicalBarriers: You're on an alien planet, but it just so happens to have a nitrogen-oxygen atmosphere and liquid water. Most of the sea life is edible, and those that aren't are specifically stated to be poisonous in order to avoid being eaten by larger species, rather than just being incompatible with a human digestive system. Of course, this is [[AcceptableBreaksFromReality somewhat necessary]] for the game to be enjoyable to play,[[note]]as it's rather hard to survive when there's nothing to eat or the very air burns your face off,[[/note]] though it ''would'' be nice to imagine you at least give the Reapers indigestion after they eat you for the hundredth time.
* NoticeThis: Important stuff like databoxes and [=PDAs=] glows brightly in the dark, which makes them easy to spot even from long distances. It also makes it advisable to switch off your flashlight at least once per room while you're exploring wrecks so you don't miss them because your light overpowered theirs. Scannable fragments that unlock new blueprints tend to be a bit less obvious, but they do stick out from among the worthless rubble once you know what to look out for, and they also trigger a small scanner icon in the lower right corner of the screen when you enter their rough vicinity to alert you to their presence (helpful in wrecks because the fragments often blend in very well with the walls and floors).
* NotTheIntendedUse: The Picture Frame is meant for pictures taken in-game. However, since those pictures are stored in a folder, it is possible to take any image that you want, place it in the folder, and then have the game treat it as another in-game picture. This can be used for an extra level of base customization, but the most popular use is to upload a user-made map because the game has no mapping system of its own.
* OceanPunk: It's a mostly underwater survival game.
* OneGenderRace: The PDA mentions that all life on Planet 4546B is only one sex. They do not reproduce asexually though as each individual can both carry and fertilize eggs.
* OxygenatedUnderwaterBubbles: Either naturally when produced by Purple Brain Coral or manmade when produced by a pipe system.
* OxygenMeter: Unaided, you can hold your breath for 45 seconds, and going below 100 meters without a Rebreather cuts that time in half. You can get tanks which will add to your air, but you can still run out if you're outside of a powered vehicle or station. If you lose power, you'll soon lose air there, too. Running out won't immediately kill you, though; you'll begin to black out when your meter runs down, and if you manage to get a gulp of air before completely losing consciousness, it'll revive you.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
* LilyPadPlatform: Subverted. There ''is'' a lilypad biome, but you can't walk on them without falling through.
[[/folder]]

[[folder:M-Z (unsorted)]]
* MadeOfIron: Most hostile fauna counts. It's extremely difficult to outright kill anything larger than a cat. Even the Prawn Suit's giant drill arm will merely chase off attacking predators like Bone Sharks for a short while; you can drill into one for a full minute or more without the beast dying, and that's next to impossible to pull off anyway without glitches because all predators are much faster than the Prawn. You need to get really creative if you want something dead.
* MeaningfulName: Invoked, since your PDA is generating names for creatures as you encounter them, so almost all of them have names directly tied to their distinctive traits. In fact, the Reginald actually sticks out as being the ''only'' fauna that doesn't have such a name.
* MegaCorp: The 37 "trans-gov" corporations that control the galaxy. Two matter in the game: The Alterra Corporation that owns the ''Aurora'' and makes just about everything seen, and the Mongolian Empire that owns the ''Degasi''. [[note]]A "trans-gov" is legally defined in-universe as any entity, corporate or state, which claims ownership of at least one planet and one phase gate under the terms of The Charter. There are a few actual governments in their ranks, but most are implied to be full-blown {{Mega Corp}}s.[[/note]]
* MeleeATrois: Different species of hostile creatures tend to dislike each other just as much as the player, and will often fight if they happen to be in the same vicinity. In particular, many creatures will automatically attack any warpers that happen to enter their territory.



* MixAndMatchCritter: Some of the creatures have elements of two or more creatures. The Crabsquid is an octopus with Japanese Spider Crab legs and claws. The Sea Dragon Leviathan is a crocodilian with squid tentacles for its lower half, and the Emperor Leviathan is similar but with an insectoid/crustacean head.



* MorePredatorsThanPrey: The dev team works hard to avert this one: sure, there are some big, scary fish in the sea, but there are also lots of little, less scary fish.



* NatureIsNotNice: Most of the predators don't deliberately seek ''you'' out; you just happen to be snack-sized and in the vicinity. They'll just as happily eat small fish. Likewise, the greatest threat in survival mode isn't necessarily the wildlife itself; it's running out of food and water,[[note]]at least until you get a habitat with a fish tank and farm areas built,[[/note]] or running out of oxygen while looking for resources.
* NoBiochemicalBarriers: You're on an alien planet, but it just so happens to have a nitrogen-oxygen atmosphere and liquid water. Most of the sea life is edible, and those that aren't are specifically stated to be poisonous in order to avoid being eaten by larger species, rather than just being incompatible with a human digestive system. Of course, this is [[AcceptableBreaksFromReality somewhat necessary]] for the game to be enjoyable to play,[[note]]as it's rather hard to survive when there's nothing to eat or the very air burns your face off,[[/note]] though it ''would'' be nice to imagine you at least give the Reapers indigestion after they eat you for the hundredth time.
* NoBodyLeftBehind: Despite having 157 people on board, not a single shred of a body can be found in the game. No blood splatters, no bones, no clothing scraps, no nothing. Meanwhile, several wrecks contain potted plants that got through the crash in one piece. Justified as [[spoiler:the Warpers kidnapped and/or killed all of the survivors. And if it's the latter, their scythe-like arms are definitely sharp enough to avoid leaving behind tangible amounts of remains.]] Also, the PDA mentions that many indigineous lifeforms in and around the ''Aurora'' have trace elements of human tissue in their digestive tracts, so whatever remains did exist were simply eaten by the local fauna.

to:

* NatureIsNotNice: Most of the predators don't deliberately seek ''you'' out; you just happen to be snack-sized and in the vicinity. They'll just as happily eat small fish. Likewise, the greatest threat in survival mode isn't necessarily the wildlife itself; it's running out of food and water,[[note]]at least until you get a habitat with a fish tank and farm areas built,[[/note]] or running out of oxygen while looking for resources.
* NoBiochemicalBarriers: You're on an alien planet, but it just so happens to have a nitrogen-oxygen atmosphere and liquid water. Most of the sea life is edible, and those that aren't are specifically stated to be poisonous in order to avoid being eaten by larger species, rather than just being incompatible with a human digestive system. Of course, this is [[AcceptableBreaksFromReality somewhat necessary]] for the game to be enjoyable to play,[[note]]as it's rather hard to survive when there's nothing to eat or the very air burns your face off,[[/note]] though it ''would'' be nice to imagine you at least give the Reapers indigestion after they eat you for the hundredth time.
* NoBodyLeftBehind: Despite having 157 people on board, not a single shred of a body can be found in the game. No blood splatters, no bones, no clothing scraps, no nothing. Meanwhile, several wrecks contain potted plants that got through the crash in one piece. Justified as [[spoiler:the Warpers kidnapped and/or killed all of the survivors. And if it's the latter, their scythe-like arms are definitely sharp enough to avoid leaving behind tangible amounts of remains.]] Also, the PDA mentions that many indigineous indigenous lifeforms in and around the ''Aurora'' have trace elements of human tissue in their digestive tracts, so whatever remains did exist were simply eaten by the local fauna.



** Ampeels and crabsquids are unaffected by the aforementioned Seamoth perimeter defense system, probably because they utilize electric attacks themselves.

to:

** Ampeels and crabsquids Crabsquids are unaffected by the aforementioned Seamoth perimeter defense system, probably because they utilize electric attacks themselves.



* NoticeThis: Important stuff like databoxes and [=PDAs=] glows brightly in the dark, which makes them easy to spot even from long distances. It also makes it advisable to switch off your flashlight at least once per room while you're exploring wrecks so you don't miss them because your light overpowered theirs. Scannable fragments that unlock new blueprints tend to be a bit less obvious, but they do stick out from among the worthless rubble once you know what to look out for, and they also trigger a small scanner icon in the lower right corner of the screen when you enter their rough vicinity to alert you to their presence (helpful in wrecks because the fragments often blend in very well with the walls and floors).
* NotTheIntendedUse: The Picture Frame is meant for pictures taken in-game. However, since those pictures are stored in a folder, it is possible to take any image that you want, place it in the folder, and then have the game treat it as another in-game picture. This can be used for an extra level of base customization, but the most popular use is to upload a user-made map because the game has no mapping system of its own.
* NothingIsScarier: The Dunes and the Mountains biomes. Once you transition there, the music stops and all ambient noise goes quiet, save for the player's. All the better to hear the distant screams of Reapers.

to:

* NoticeThis: Important stuff like databoxes and [=PDAs=] glows brightly in the dark, which makes them easy to spot even from long distances. It also makes it advisable to switch off your flashlight at least once per room while you're exploring wrecks so you don't miss them because your light overpowered theirs. Scannable fragments that unlock new blueprints tend to be a bit less obvious, but they do stick out from among the worthless rubble once you know what to look out for, and they also trigger a small scanner icon in the lower right corner of the screen when you enter their rough vicinity to alert you to their presence (helpful in wrecks because the fragments often blend in very well with the walls and floors).
* NotTheIntendedUse: The Picture Frame is meant for pictures taken in-game. However, since those pictures are stored in a folder, it is possible to take any image that you want, place it in the folder, and then have the game treat it as another in-game picture. This can be used for an extra level of base customization, but the most popular use is to upload a user-made map because the game has no mapping system of its own.
* NothingIsScarier:
NothingIsScarier:
**
The Dunes and the Mountains biomes. Once you transition there, the music stops and all ambient noise goes quiet, save for the player's. All the better to hear the distant screams of Reapers.



* OceanPunk: It's a mostly underwater survival game.



* OhCrap

to:

* OhCrapOhCrap:



** Also the likely reaction of a player being in position to witness [[spoiler:the demise of the ''Sunbeam'']] for the first time. [[spoiler: Its proposed landing site is right outside the Quarantine Enforcement Platform, which resembles a curious alien tower when idle. Right before the hapless ship enters the atmosphere, the Platform begins to emit an alarm and starts changing shape. Before too long, the player will realize it's beginning to resemble a colossal gun turret. One that is now tracking the approaching ''Sunbeam''...]]
* OneGenderRace: The PDA mentions that all life on Planet 4546B is only one sex, they do not reproduce asexually though as each individual can both carry and fertilize eggs.

to:

** Also the likely reaction of a player being in position to witness [[spoiler:the demise of the ''Sunbeam'']] for the first time. [[spoiler: Its [[spoiler:Its proposed landing site is right outside the Quarantine Enforcement Platform, which resembles a curious alien tower when idle. Right before the hapless ship enters the atmosphere, the Platform begins to emit an alarm and starts changing shape. Before too long, the player will realize it's beginning to resemble a colossal gun turret. One that is now tracking the approaching ''Sunbeam''...]]
* OneGenderRace: The PDA mentions that all life on Planet 4546B is only one sex, they do not reproduce asexually though as each individual can both carry and fertilize eggs.
]]



** The Quarantine Enforcement Platform, AKA [[spoiler:the cool-looking alien structure where the ''Sunbeam'' is scheduled to pick you up for evacuation, is actually a giant anti-orbit weapons platform that does this to any ship that enters its firing range. It brought down the ''Aurora'' in one shot and does the same to the ''Sunbeam'', only the latter explodes right away without even a chance of performing an emergency landing.]]

to:

** The Quarantine Enforcement Platform, AKA [[spoiler:the cool-looking alien structure where the ''Sunbeam'' is scheduled to pick you up for evacuation, is actually a giant anti-orbit weapons platform that does this to any ship that enters its firing range. It brought down the ''Aurora'' in one shot and does the same to the ''Sunbeam'', only the latter explodes right away without even a chance of performing an emergency landing.]]landing]].



* OxygenatedUnderwaterBubbles: Either naturally when produced by Purple Brain Coral or manmade when produced by a pipe system.
* OxygenMeter: Unaided, you can hold your breath for 45 seconds, and going below 100 meters without a Rebreather cuts that time in half. You can get tanks which will add to your air, but you can still run out if you're outside of a powered vehicle or station. If you lose power, you'll soon lose air there, too. Running out won't immediately kill you, though; you'll begin to black out when your meter runs down, and if you manage to get a gulp of air before completely losing consciousness, it'll revive you.


Added DiffLines:

* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
* LilyPadPlatform: Subverted. There ''is'' a lilypad biome, but you can't walk on them without falling through.
[[/folder]]

[[folder:Unsorted]]


* KrakenAndLeviathan
** The PDA uses the term "Leviathan Class" to describe only the biggest biologically feasible fauna. Note that this is just a size classification, the [[GentleGiant Reefbacks and Sea Treaders]] are considered Leviathan Class.
** On the other hand, if a species includes the word "Leviathan" in their actual name (e.g. Reaper Leviathan, Ghost Leviathan), it's probably best to [[NamesToRunAwayFromReallyFast run and don't look back]].
** One PDA entry indicates that the tremendous size of the [[spoiler:Sea Emperor]] means they're going to have to [[ReadingsAreOffTheScale recalibrate their size scale]].
** In the [[spoiler:Lost River biome]], players can come across a few multi-million year old skeletons. One in particular has jaws large enough to fit the Cyclops comfortably inside, just in case you ever wanted to know what it's like to be a Tic Tac.
** A "kraken" type creature is a frequent suggestion on forums and the game's subreddit. There were rumors that such a creature inhabited the Void, but this turned out to be an UrbanLegendOfZelda.
* LoadingScreen: There's only one, when you're starting a new game or loading a saved game.
* LoadsAndLoadsOfLoading: Unless you have a fast computer and ''very'' fast hard drive, you will be staring at that initial loading screen for several minutes.[[note]]Even on a mid-range SATA 3 SSD, drive the game can take almost a whole minute to load. Having a budget traditional laptop hard drive (whose speed clocks in at 5400rpm) would probably afford you enough time to go raid the refrigerator for a quick snack while the game is loading. While the game was still in development, the loading time will actually increase the more you interacted with the world due to the way the save games worked. Apparently this was fixed in the final release[[/note]]. Thankfully the game switches to dynamic loading after that and you'll never see a loading screen ever again once you're in the game, unless you quit back to the title screen.



* LateToTheTragedy
** Seconds after the protagonist escapes the ''Aurora'', they are knocked out cold by a panel that has gotten loose. By the time they wake up, [[spoiler:all other people who made it off the ship have already perished]]. And that's to say nothing about what happened on Planet 4546B in the first place.
** The presence of a meteor in the Dunes and some of the PDA's suggestions imply [[spoiler:the Precursors qualify for this trope as well, and releasing the Kharaa only rubbed salt in the wound.]]
* LethalLavaLand: The Inactive Lava Zone and the Lava Lakes.
* LightningBruiser: Reaper Leviathans, full stop. They can swallow the player whole, can crack a Seamoth in two hits and players are ''physically incapable of outrunning them''.



* LilyPadPlatform: Subverted. There ''is'' a lilypad biome, but you can't walk on them without falling through.



[[folder:H-L (unsorted)]]
* KrakenAndLeviathan
** The PDA uses the term "Leviathan Class" to describe only the biggest biologically feasible fauna. Note that this is just a size classification, the [[GentleGiant Reefbacks and Sea Treaders]] are considered Leviathan Class.
** On the other hand, if a species includes the word "Leviathan" in their actual name (e.g. Reaper Leviathan, Ghost Leviathan), it's probably best to [[NamesToRunAwayFromReallyFast run and don't look back]].
** One PDA entry indicates that the tremendous size of the [[spoiler:Sea Emperor]] means they're going to have to [[ReadingsAreOffTheScale recalibrate their size scale]].
** In the [[spoiler:Lost River biome]], players can come across a few multi-million year old skeletons. One in particular has jaws large enough to fit the Cyclops comfortably inside, just in case you ever wanted to know what it's like to be a Tic Tac.
** A “kraken” type creature is a frequent suggestion on forums and the game's subreddit.
* LateToTheTragedy
** Seconds after the protagonist escapes the ''Aurora'', they are knocked out cold by a panel that has gotten loose. By the time they wake up, [[spoiler:all other people who made it off the ship have already perished]]. And that's to say nothing about what happened on Planet 4546B in the first place.
** The presence of a meteor in the Dunes and some of the PDA's suggestions imply [[spoiler:the Precursors qualify for this trope as well, and releasing the Kharaa only rubbed salt in the wound.]]
* LethalLavaLand: The Inactive Lava Zone and the Lava Lakes.
* LightningBruiser: Reaper Leviathans, full stop. They can swallow the player whole, can crack a Seamoth in two hits and players are ''physically incapable of outrunning them''.
* LilyPadPlatform
** Presumed to be the case with the yet-to-be implemented Lilypad Biome.
** Can actually be used in the [[spoiler:Lost River biome]] with the rare Brine Lily.
* LoadingScreen: There's only one, when you're starting a new game or loading a saved game.
* LoadsAndLoadsOfLoading: Unless you have a fast computer and ''very'' fast hard drive, you will be staring at that initial loading screen for several minutes.[[note]]Even on a mid-range SATA 3 SSD, drive the game can take almost a whole minute to load. Having a budget traditional laptop hard drive (whose speed clocks in at 5400rpm) would probably afford you enough time to go raid the refrigerator for a quick snack while the game is loading. While the game was still in development, the loading time will actually increase the more you interacted with the world due to the way the save games worked. Apparently this was fixed in the final release[[/note]]. Thankfully the game switches to dynamic loading after that and you'll never see a loading screen ever again once you're in the game, unless you quit back to the title screen.
[[/folder]]


* FallingDamage: It does exist in the game, though you don't need to worry about it much since ''Subnautica'' is mostly set underwater. Just be careful while exploring the ''Aurora'' or the islands.



* HotBlade: One of the upgrades for the Survival Knife equips it with a heating element, causing the edges of the blade to [[PowerGlows glow red]]. [[DownplayedTrope Mostly this is used to kill and cook edible wildlife in one action]], the upgrade actually reduces the damage dealt with the blade in exchange for its new ability.
* InUniverseGameClock: There's a day-night cycle which not only informs what creatures you'll see, but also how aggressive they'll act; most are bolder at night. Story progression is also partially determined by the passage of time. Case in point: the ''Aurora'''s reactor goes critical after seven days have passed.
* InVehicleInvulnerability
** PlayedWith in the opening cinematic. The player climbs into an escape pod and gets promptly knocked out by a piece of metal smacking them in the face. However [[spoiler:they also end up being the only survivor of the ''Aurora'' crash]].
** Played straight by all vehicles, which have a separate health meter from the player. While running into things may damage your vehicle, you'll never be knocked unconscious by flying shrapnel like in the opening movie. The Cyclops was once immune to the attacks of creatures, even Reapers (who can destroy your Seamoth in two bites), but it now has a health bar like the others and can be damaged and destroyed if you're not careful.
** And then subverted to hell and back by the [[{{Cyborg}} Warpers]], whice have the ability to teleport you out of your vehicle at will so they can attack you in melee. Extremely annoying no matter the circumstances, especially since Warper attacks are among the most powerful in the game, and those things are barely larger than a human. They can't do this when you're piloting a Cyclops, though]].
* ItemFarming
** Titanium and quartz in particular, because those are needed for bases and vehicles.
** The primary function of the Alien Containment, which makes farming food, water and energy a breeze, freeing up time to truly begin your exploration of the ocean.
** Players have come up with a trick for farming Stalker Teeth: approach Stalker territory and drop a handful of scrap metal pieces in the outer area. The closest Stalker will soon proceed to swim back and forth between the pieces, mostly ignoring the player while losing teeth regularly.
* JetPack: A vehicle announced for possible inclusion after V1.0.
* {{Kaiju}}: The infamous Leviathan-class lifeforms are gigantic, measuring between 55m (Reaper) and 200m (Sea Emperor) in length. It's probably [[ShoutOut not a coincidence]] that some of them bear more than a few similarities to the villainous monsters in ''Film/PacificRim''. Their database entries also lampshade that these monsters are rapidly approaching the [[SquareCubeLaw size limit for sustainable organic lifeforms]]... which is immediately turned on its head when you find the aptly named Gargantuan Fossil, the remains of an ancient super predator that died roughly 3,000,000 years ago before it came to rest in the Lost River Bone Fields. Its skull alone is almost 100 meters long (large enough to swallow the Cyclops whole), its canines measure 10-12m, and the whole creature is estimated to have exceeded 1,200m in length back when it was alive. Kinda makes Reapers, Ghosts and Sea Dragons look cuddly when you realize this thing ate those for breakfast.
* KilledOffForReal: If you somehow manage to actually kill a Leviathan-class creature, it will thankfully stay dead and never respawn.



* SoftWater: Played straight -- you can jump into the ocean from any height without fear of injury. Just be careful not to hit anything solid on the way down.

to:

* SoftWater: Played straight -- straight; you can jump into the ocean from any height without fear of injury. Just be careful not to hit anything solid on the way down.down -- the game '''''does''''' have FallingDamage on dry land.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
[[/folder]]

[[folder:H-L (unsorted)]]



* HeelFaceTurn: In a meta example, the Cute Fish was the original Crashfish, a fish which hides inside a plant and pops out to charge at you and explode if you get too close. However, everyone agreed it was too cute, and rewrote the Cute Fish's AI as a pet which follows you around and chirps delightedly. In the final release, the Cute Fish was renamed to the Cuddlefish.



** The player can do this to themselves if they breed Crashfish and then set them loose outside their base. [[spoiler:Sure, the fish won't attack you because it grew up docile, but it ''will'' attack other fish by suicide bombing them right next to the hull of your base, causing a breach, a flood, and a panicked flail as the player runs all over trying to find the hole. [[SuspiciouslySpecificDenial Why, no, this isn't inspired by a true story at all...]]]]

to:

** The player can do this to themselves if they breed Crashfish and then set them loose outside their base. [[spoiler:Sure, Sure, the fish won't attack you because it grew up docile, but it ''will'' attack other fish by suicide bombing them right next to the hull of your base, causing a breach, a flood, and a panicked flail as the player runs all over trying to find the hole. [[SuspiciouslySpecificDenial Why, no, this isn't inspired by a true story at all...]]]]]]



* HopeSpot: [[spoiler:Another ship, the ''Sunbeam'', picks up the emergency distress signal from the ''Aurora'' and comes to help... only to share the ''Aurora'''s fate, being blasted out of the sky by the Quarantine Enforcement Platform. There are no survivors this time]].
* HotBlade: One of the upgrades for the Survival Knife equips it with a heating element, causing the edges of the blade to [[PowerGlows glow red]]. [[DownplayedTrope Mostly this is used to kill and cook edible wildlife in one action]], the upgrade actually reduces the damage dealt with the blade in exchange for its new ability.
* ImprovisedWeapon: The developers (and, InUniverse, the Alterra company) intentionally made the game lack true weaponry besides Torpedos, but that doesn't stop particularly paranoid or violent players from taking revenge against the sea life.

to:

* HopeSpot: [[spoiler:Another Another ship, the ''Sunbeam'', picks up the emergency distress signal from the ''Aurora'' and comes to help... only [[spoiler:only to share the ''Aurora'''s fate, being blasted out of the sky by the Quarantine Enforcement Platform. There are no survivors this time]].
* HotBlade: One of the upgrades for the Survival Knife equips it with a heating element, causing the edges of the blade to [[PowerGlows glow red]]. [[DownplayedTrope Mostly this is used to kill and cook edible wildlife in one action]], the upgrade actually reduces the damage dealt with the blade in exchange for its new ability.
* ImprovisedWeapon: The developers (and, InUniverse, the Alterra company) intentionally made the game lack true weaponry besides Torpedos, torpedoes, but that doesn't stop particularly paranoid or violent players from taking revenge against the sea life.



* InUniverseGameClock: There's a day-night cycle which not only informs what creatures you'll see, but also how aggressive they'll act; most are bolder at night. Story progression is also partially determined by the passage of time. Case in point: the ''Aurora'''s reactor goes critical after seven days have passed.
* InVehicleInvulnerability
** PlayedWith in the opening cinematic. The player climbs into an escape pod and gets promptly knocked out by a piece of metal smacking them in the face. However [[spoiler:they also end up being the only survivor of the ''Aurora'' crash]].
** Played straight by all vehicles, which have a separate health meter from the player. While running into things may damage your vehicle, you'll never be knocked unconscious by flying shrapnel like in the opening movie. The Cyclops was once immune to the attacks of creatures, even Reapers (who can destroy your Seamoth in two bites), but it now has a health bar like the others and can be damaged and destroyed if you're not careful.
** And then subverted to hell and back by [[spoiler:the Warpers, biomechanical menaces with the ability to teleport you out of your vehicle at will so they can attack you in melee. Extremely annoying no matter the circumstances, especially since Warper attacks are among the most powerful in the game, and those things are barely larger than a human. They can't do this when you're piloting a Cyclops, though.]]
* ItemFarming
** Titanium and quartz in particular, because those are needed for bases and vehicles.
** The primary function of the Alien Containment, which makes farming food, water and energy a breeze, freeing up time to truly begin your exploration of the ocean.
** Players have come up with a trick for farming Stalker Teeth: approach Stalker territory and drop a handful of scrap metal pieces in the outer area. The closest Stalker will soon proceed to swim back and forth between the pieces, mostly ignoring the player while losing teeth regularly.
* JetPack: A vehicle announced for possible inclusion after V1.0.



* {{Kaiju}}: The infamous Leviathan-class lifeforms are gigantic, measuring between 55m (Reaper) and 200m (Sea Emperor) in length. It's probably [[ShoutOut not a coincidence]] that some of them bear more than a few similarities to the villainous monsters in ''Film/PacificRim''. Their database entries also lampshade that these monsters are rapidly approaching the [[SquareCubeLaw size limit for sustainable organic lifeforms]]... which is immediately turned on its head when you find the aptly named Gargantuan Fossil, the remains of an ancient super predator that died roughly 3,000,000 years ago before it came to rest in the Lost River Bone Fields. Its skull alone is almost 100 meters long (large enough to swallow the Cyclops whole), its canines measure 10-12m, and the whole creature is estimated to have exceeded 1,200m in length back when it was alive. Kinda makes Reapers, Ghosts and Sea Dragons look cuddly when you realize this thing ate those for breakfast.
* KilledOffForReal: If you somehow manage to actually kill a Leviathan class creature, it will thankfully stay dead and never respawn.


Added DiffLines:

* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
[[/folder]]

[[folder:H-L (unsorted)]]


* GravityScrew
** The whole point of the Propulsion Cannon, a tool meant for picking up and moving/throwing small to medium-sized objects. Seeing how the thing is a barely disguised {{Expy}} of ''VideoGame/HalfLife2'''s Gravity Gun down to a very similar look, this shouldn't come as a surprise.
** [[spoiler:The Quarantine Enforcement Platform]] has a vertical antigrav lift to facilitate movement between the ground floor and the sublevel a hundred meters below.
* GuideDangIt:
** Part of what makes ''Subnautica'''s survival atmosphere so intense is that you're told next to nothing upon starting a new game, and things barely improve from there on. There's no instructions, no tutorial, not even a friggin' ''map'', least of all something like a questlog (or even quests to begin with). The only real HUD markers you get are from the few ''Aurora'' survivors, and that ends fairly quickly. Afterwards you're completely on your own, and unless you consult a guide, you can spend hours upon hours getting lost in subterranean tunnel systems, wondering if there's even a point in risking your life down there, and if there is, what you're supposed to accomplish in this place. [[TropesAreNotBad May sound bad, but]] it makes for an epic adventure full of astounding discoveries.
** Any blueprints you learn will list the ingredients you need to create the item. However, if one or more those ingredients also require a blueprint -- for example, aerogel -- that you haven't learned, the game won't tell you how to make them until you've found the necessary components.
* HealThyself: Medical packs heal you by 50 points instantaneously.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.
[[/folder]]

[[folder:G-L (unsorted)]]



* GravityScrew
** The whole point of the Propulsion Cannon, a tool meant for picking up and moving/throwing small to medium-sized objects. Seeing how the thing is a barely disguised {{Expy}} of ''VideoGame/HalfLife2'''s Gravity Gun down to a very similar look, this shouldn't come as a surprise.
** [[spoiler:The Quarantine Enforcement Platform]] has a vertical antigrav lift to facilitate movement between the ground floor and the sublevel a hundred meters below.



* GreenHillZone: The Safe Shallows.
* GuideDangIt:
** Part of what makes ''Subnautica'''s survival atmosphere so intense is that you're told next to nothing upon starting a new game, and things barely improve from there on. There's no instructions, no tutorial, not even a friggin' ''map'', least of all something like a questlog (or even quests to begin with). The only real HUD markers you get are from the few ''Aurora'' survivors, and that ends fairly quickly. Afterwards you're completely on your own, and unless you consult a guide, you can spend hours upon hours getting lost in subterranean tunnel systems, wondering if there's even a point in risking your life down there, and if there is, what you're supposed to accomplish in this place. [[TropesAreNotBad May sound bad, but]] it makes for an epic adventure full of astounding discoveries.
** Any blueprints you learn will list the ingredients you need to create the item. However, if one or more those ingredients also require a blueprint -- for example, aerogel -- that you haven't learned, the game won't tell you how to make them until you've found the necessary components.

to:

* GreenHillZone: The aptly-titled Safe Shallows.
* GuideDangIt:
** Part
Shallows is one of what makes ''Subnautica'''s survival atmosphere so intense is that you're told next the only biomes where the player doesn't have to nothing upon starting a new game, and things barely improve from there on. worry about predators. There's no instructions, no tutorial, not even a friggin' ''map'', least of all something still threats like a questlog (or even quests to begin with). The only real HUD markers gasopods around, but they'll leave you get are from the few ''Aurora'' survivors, and that ends fairly quickly. Afterwards you're completely on your own, and unless alone if you consult a guide, you can spend hours upon hours getting lost in subterranean tunnel systems, wondering if there's even a point in risking your life down there, and if there is, what you're supposed to accomplish in this place. [[TropesAreNotBad May sound bad, but]] it makes for an epic adventure full of astounding discoveries.
** Any blueprints you learn will list the ingredients you need to create the item. However, if one or more those ingredients also require a blueprint -- for example, aerogel -- that you haven't learned, the game won't tell you how to make
give them until you've found the necessary components.space.



* HealThyself: Medical packs will heal you completely and instantly. It's unknown if future updates will add tiers to your supplies, so you'll have to be more careful in the beginning when you can't make the strongest ones.
** In the final release, Medical Packs only heal 50 points, but still do so instantly.

to:

* HealThyself: Medical packs will heal you completely SolidGoldPoop: Sea Treader dung can be collected and instantly. It's unknown if future updates will add tiers to your supplies, so you'll have to be more careful in used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and
the beginning when you can't make the strongest ones.
** In the final release, Medical Packs only heal 50 points, but still do so instantly.
definitely-scrapped Grabcrab.
[[/folder]]

[[folder:H-L (unsorted)]]


** In ''BelowZero'', meanwhile, you have the Titan Holefish, a near-circular, flat fish with a giant hold in its middle that's ''large enough for the player to swim through!''

to:

** In ''BelowZero'', ''Below Zero'', meanwhile, you have the Titan Holefish, a near-circular, flat fish with a giant hold in its middle that's ''large enough for the player to swim through!''



* SingleBiomePlanet: 4546B is officially classified as a "Category 3 Ocean Planet", seemingly playing this trope straight. [[SubvertedTrope However]], the underwater world has rich and diverse areas, varying not only by location but also by depth. There are also two tropical islands on the map, plus the arctic biome that it the setting of ''Below Zero''.

to:

* EnemyScan: One of the core tools is a scanner to scan just about everything, hostile fauna and flora included. The results of each completed scan are stored in the PDA, which therefore in part serves as a MonsterCompendium.
* EnemyMine:
** Different species of predators are just as likely to territorially attack each other as they are to attack you. This is especially visible in the [[spoiler:second Degassi seabase]], where Warpers and Crabsquids will fight over the exclusive right to harass you while you're exploring it.
** There is a taming mechanic. Holding Peepers or other small prey fish in your quick-slots will let Stalkers eat them, and they won't attack you. For a while. They even occasionally bring piles of scrap.
** It seems to work for Reaper Leviathans as well, as people have tried so and uploaded the results to youtube, but don't count on it saving your ass. Said videos feature an animation where the player raises their arms, the screen goes black, but there's no You Died message. The Reaper removed all prey fish from your inventory and spat you out.
* EquipmentUpgrade: There's a modification station, a vehicle modification station, and two specialized fabricators to improve your stuff.
* EverythingIsAnIPodInTheFuture: All Alterra equipment is shiny white, with smooth surfaces and rounded edges and corners. Any larger sea base you build will inevitably look like an Apple designer's wet dream.
* EverythingTryingToKillYou: Averted, particularly in the [[MeaningfulName Safe Shallows]]: there are lots of passive fish which will never harm you at all, and also plenty of defensive fish who will only attack if you get too close or bother them. The truly aggressive species are actually a minority, but they're still almost omnipresent and extremely dangerous even so, seeing how even a single one can often kill you in a flash.
* FamilyFriendlyFirearms: Lethal firearms are forbidden from being created by the fabricator (something about a [[NoodleIncident massacre on Obraxis Prime]]). You can arm some of your submersibles with torpedoes, but the only true handheld weapon is the non-lethal stasis rifle.[[note]]There is also the survival knife and the propulsion/repulsion cannons, but these are more tools than weapons.[[/note]]
** The only true firearm is [[spoiler:an alien rifle suspended in an impenetrable display case within the Quarantine Enforcement Platform.]]
* FastballSpecial: Any creature caught and flung by the Propulsion cannon. Pair it with tank-grown [[ActionBomb Crashfish]] for explosive results.
* FinalDeathMode: Hardcore mode. Exactly like Survival mode, except you only have one life and have no oxygen warnings. Forget to check your meters at your own peril.
* FirstPersonSnapshooter: Optional. Pictures taken can be used as decoration in one's base by means of the Picture Frame.
* FluffyTamer: The secondary function of the Alien Containment module, as any predator you hatch inside it will be docile towards you. This continues to apply if you release them from the tank and they become full grown. Ever wanted a pet [[ShockAndAwe Ampeel]], [[GiantSquid Crabsquid]] or [[ThreateningShark Boneshark]]? Now's your chance.
* GentleGiant
** Some of the creatures you encounter will be this, such as the monstrous, loud, but harmless Reefback. You won't know unless you get spotted by them or go up to them, though.
** The Titan Holefish takes this UpToEleven, this massive fish has gotten so reliant on the small fish it shares a [[TheSymbiote symbiotic relationship]] with for food and defense that it's in a perpetual state of calm and seems to be barely aware of its surroundings.
* GlowingFlora: Many deep-sea plants (this includes a ''tree'') are just as bioluminescent as the rest of the living things living there. This was probably to exaggerate the stereotypical abyssal theme, since many bioluminescent creatures live in this biome in Real Life.
* SingleBiomePlanet: 4546B is officially classified as a "Category 3 Ocean Planet", seemingly playing this trope straight. [[SubvertedTrope However]], the underwater world has rich and diverse areas, varying not only by location but also by depth. There are also two tropical islands on the map, plus the arctic biome that it is the setting of ''Below Zero''.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
[[/folder]]



[[folder:D-L (unsorted)]]



* EffortlessAchievement: The full release still has a few of these. [[ExactlyWhatItSaysOnTheTin Getting your feet wet]] and consequently building your first base piece, which takes a little effort. You'll unlock achievements for building the three currently implemented vehicles and exploring story required locales. [[spoiler: though they seem to be bugged, building the escape rocket and launching the time capsule also are achievements. The Neptune is pretty resource heavy but the time capsule is literally a button press to launch, and usually launches automatically with the rocket's ignition.]]

to:

* EffortlessAchievement: The full release still has a few of these. [[ExactlyWhatItSaysOnTheTin Getting your feet wet]] and consequently building your first base piece, which takes a little effort. You'll unlock achievements for building the three currently implemented vehicles and exploring story required locales. [[spoiler: though Though they seem to be bugged, building the escape rocket and launching the time capsule also are achievements. The Neptune is pretty resource heavy but the time capsule is literally a button press to launch, and usually launches automatically with the rocket's ignition.]]



* EnemyScan: One of the core tools is a scanner to scan just about everything, hostile fauna and flora included. The results of each completed scan are stored in the PDA, which therefore in part serves as a MonsterCompendium.
* EnemyMine:
** Different species of predators are just as likely to territorially attack each other as they are to attack you. This is especially visible in the [[spoiler:second Degassi seabase]], where Warpers and Crabsquids will fight over the exclusive right to harass you while you're exploring it.
** There is a taming mechanic. Holding Peepers or other small prey fish in your quick-slots will let Stalkers eat them, and they won't attack you. For a while. They even occasionally bring piles of scrap.
** It seems to work for Reaper Leviathans as well, as people have tried so and uploaded the results to youtube, but don't count on it saving your ass. Said videos feature an animation where the player raises their arms, the screen goes black, but there's no You Died message. The Reaper removed all prey fish from your inventory and spat you out.
* EquipmentUpgrade: There's a modification station, a vehicle modification station, and two specialized fabricators to improve your stuff.



* EverythingIsAnIPodInTheFuture: All Alterra equipment is shiny white, with smooth surfaces and rounded edges and corners. Any larger sea base you build will inevitably look like an Apple designer's wet dream.
* EverythingTryingToKillYou: Averted, particularly in the [[MeaningfulName Safe Shallows]]: there are lots of Passive fish which will never harm you at all, and also plenty of Defensive fish who will only attack if you get too close or bother them. The truly Aggressive species are actually a minority, but they're still almost omnipresent and extremely dangerous even so, seeing how even a single one can often kill you in a flash.



* FamilyFriendlyFirearms: Lethal firearms are forbidden from being created by the fabricator (something about a [[NoodleIncident massacre on Obraxis Prime]]). You can arm some of your submersibles with torpedoes, but the only true handheld weapon is the non-lethal stasis rifle.[[note]]There is also the survival knife and the propulsion/repulsion cannons, but these are more tools than weapons.[[/note]]
** The only true firearm is [[spoiler:an alien rifle suspended in an impenetrable display case within the Quarantine Enforcement Platform.]]
* FastballSpecial: Any creature caught and flung by the Propulsion cannon, pair it with tank-grown [[ActionBomb Crashfish]] for explosive results.
* FinalDeathMode: Hardcore mode. Exactly like Survival mode, except you only have one life and have no oxygen warnings. Forget to check your meters at your own peril.
* FirstPersonSnapshooter: Optional. Pictures taken can be used as decoration in one's base by means of the Picture Frame.



* FluffyTamer: The secondary function of the Alien Containment module, as any predator you hatch inside it will be docile towards you. This continues to apply if you release them from the tank and they become full grown. Ever wanted a pet [[ShockAndAwe Ampeel]], [[GiantSquid Crabsquid]] or [[ThreateningShark Boneshark]]? Now's your chance.



* GentleGiant
** Some of the creatures you encounter will be this, such as the monstrous, loud, but harmless Reefback. You won't know unless you get spotted by them or go up to them, though.
** The Titan Holefish takes this UpToEleven, this massive fish has gotten so reliant on the small fish it shares a [[TheSymbiote symbiotic relationship]] with for food and defense that it's in a perpetual state of calm and seems to be barely aware of its surroundings.
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and the definitely-scrapped Grabcrab.



* GlowingFlora: Many deep-sea plants (this includes a ''tree'') are just as bioluminescent as the rest of the living things living there. This was probably to exaggerate the stereotypical abyssal theme, since many bioluminescent creatures live in this biome in Real Life.

to:

* GlowingFlora: Many deep-sea plants (this includes a ''tree'') are just SolidGoldPoop: Sea Treader dung can be collected and used as bioluminescent as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
* GiantEnemyCrab: The ambiguously-scrapped Rock Puncher and
the rest of the living things living there. This was probably to exaggerate the stereotypical abyssal theme, since many bioluminescent creatures live in this biome in Real Life. definitely-scrapped Grabcrab.
[[/folder]]

[[folder:G-L (unsorted)]]


* DamageIsFire: Your vehicles start sparking and smoking when they're heavily damaged, and the Cyclops actually starts burning from the inside, forcing you to drop everything and put the fires out lest you suffocate. There's even a dedicated fire suppression system you can build and install to make this easier.
* EarlyGameHell: When you first start off, you'll have to swim around with barely any oxygen to spare, hoping to scrounge together enough suppies for basic equipment. As you start unlocking blueprints for vehicles and base equipment, you can start venturing deeping and worry less about the basics.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.
[[/folder]]

[[folder:Subnautica: Below Zero]]
[[/folder]]



[[folder:D-L (unsorted)]]
* DamageIsFire: Your vehicles start sparking and smoking when they're heavily damaged, and the Cyclops actually starts burning from the inside, forcing you to drop everything and put the fires out lest you suffocate. There's even a dedicated fire suppression system you can build and install to make this easier.



* EarlyGameHell: When you first start off, you'll have to swim around with barely any oxygen to spare, hoping to scrounge together enough suppies for basic equipment. As you start unlocking blueprints for vehicles and base equipment, you can start venturing deeping and worry less about the basics.

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* EarlyGameHell: When you first start off, you'll have to swim around with barely any oxygen to spare, hoping to scrounge together enough suppies for basic equipment. As you start unlocking blueprints for vehicles SolidGoldPoop: Sea Treader dung can be collected and base equipment, you can start venturing deeping and worry less about the basics.used as biofuel.
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[[folder:Subnautica: Below Zero]]
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[[folder:D-L (unsorted)]]


* SingleBiomePlanet: 4546B is officially classified as a "Category 3 Ocean Planet", seemingly playing this trope straight. [[SubvertedTrope However]], the underwater world has rich and diverse areas, varying not only by location but also by depth. There are also two tropical islands on the map, plus the arctic biome that it the setting of ''Below Zero''.
* SinisterGeometry: It's debatable how evil the [[spoiler:precursors]] really are, but their buildings sure look plenty sinister. Everything's assembled from cubes of various sizes, the material is some black, nearly indestructible alloy covered in green TronLines, and the architecture itself is oppressive, monolithic and strangely reminiscent of temples/shrines even though the facilities the player visits are exclusively scientific or military in nature.
* SoftWater: Played straight -- you can jump into the ocean from any height without fear of injury. Just be careful not to hit anything solid on the way down.



* SolidGoldPoop: Sea Treader dung can be collected and used as biofuel.



* SingleBiomePlanet: Thoroughly averted; the underwater world has rich and diverse areas, varying not only by location but also by depth.
** [[spoiler: In the game's ending the planet is also shown to have a number of large islands and polar ice caps, the latter of which is planned to be the setting for an expansion pack.]]
* SinisterGeometry: It's debatable how evil the [[spoiler:precursors]] really are, but their buildings sure look plenty sinister. Everything's assembled from cubes of various sizes, the material is some black, nearly indestructible alloy covered in green TronLines, and the architecture itself is oppressive, monolithic and strangely reminiscent of temples/shrines even though the facilities the player visits are exclusively scientific or military in nature.
* SolidGoldPoop: What Sea Treaders drop. It's only useful as biofuel right now but is expected to be crucial to farming later in development.

Added DiffLines:

* RefugeInAudacity: Going straight towards certain aggressive creatures and attacking them with your knife is sometimes the best way to deal with them.
** In the same vain, trying to kill a Reaper Leviathian is very risky, long and difficult, but hopefully, you have the Stasis Rifle to help you out, and as a great payoff, they will never respawn again once they're dead, making exploration of certain areas much safer for the rest of the game.


* ScriptedEvent: Radio messages and PDA log files. The explosion of the ''Aurora'' and the [[spoiler:''Sunbeam'' being shot out of the sky]] both qualify as a VideoGameSetpiece.[[note]]Slightly subverted with the Sunbeam event- if you delay viewing it until you have cured the planet off the Kharaa virus and disabled the quarantine platform gun, they still won't rescue you, but at least they live to see another day.]]

to:

* ScriptedEvent: Radio messages and PDA log files. The explosion of the ''Aurora'' and the [[spoiler:''Sunbeam'' being shot out of the sky]] both qualify as a VideoGameSetpiece.[[note]]Slightly subverted with the Sunbeam event- if you delay viewing it until you have cured the planet off the Kharaa virus and disabled the quarantine platform gun, they still won't rescue you, but at least they live to see another day.]][[/note]]


* ScriptedEvent: Radio messages and PDA log files. The explosion of the ''Aurora'' and the [[spoiler:''Sunbeam'' being shot out of the sky]] both qualify as a VideoGameSetpiece.

to:

* ScriptedEvent: Radio messages and PDA log files. The explosion of the ''Aurora'' and the [[spoiler:''Sunbeam'' being shot out of the sky]] both qualify as a VideoGameSetpiece.[[note]]Slightly subverted with the Sunbeam event- if you delay viewing it until you have cured the planet off the Kharaa virus and disabled the quarantine platform gun, they still won't rescue you, but at least they live to see another day.]]



* SequenceBreaking: Nothing forces you to repair the radio in Lifepod 5, and it's entirely possible to play through the game without the numerous hints you normally get by listening to the frequent radio calls. However, doing so results in missing several key events and important plot points, like [[spoiler:the ''Sunbeam'' getting shot down by the Quarantine Enforcement Platform, or receiving the code for the ''Aurora'' cabin containing the Neptune blueprints]]. Once you repair the radio or build a new one, all the messages you missed will still be received one after the other, only with a lot less context and even less actual use to you.

to:

* SequenceBreaking: Nothing forces you to repair the radio in Lifepod 5, and it's entirely possible to play through the game without the numerous hints you normally get by listening to the frequent radio calls. However, doing so results in missing several key events and important plot points, like [[spoiler:the ''Sunbeam'' getting shot down by the Quarantine Enforcement Platform, or receiving the code for the ''Aurora'' cabin containing the Neptune blueprints]]. Once you repair the radio or build a new one, all the messages you missed will still be received one after the other, only with a lot less context and even less actual use to you. [[spoiler: However, not getting the Sunbeam event until after you've cured the planet of the Kharaa virus and disabled the quarantine platform gun would result in a happier ending since they won't be shot down and killed by the quarantine platform canon, only refusing to rescue you due to the debris field in the way.]]

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