[[quoteright:213:[[TabletopGame/MagicTheGathering http://static.tvtropes.org/pmwiki/pub/images/UnderwaterRuins.jpg]]]]

Staple of VideoGames and undersea [[{{Film}} movies]], the UnderwaterRuins are a [[SunkenCity city]], temple, ship, or similar place of majestic wonder submerged UnderTheSea or a lake. Typically, the ruins will be Greco-Roman in appearance (lots of columns and arches) to evoke an {{Atlantis}} like catastrophe. Usually these ruins will be artfully decayed but [[RagnarokProofing remarkably well preserved]]. This setting is a HailfirePeaks of UnderTheSea and TempleOfDoom.

You might see mer-people living in the ruins, or an actual [[UnderwaterCity domed city]] for air-breathers to live in nearby or hidden in the ruins. Expect to find areas with breathable air regardless for heroes to take a breather in.

''Intrepid Travelers Beware!'' These ruins are sometimes subject to DownTheDrain.
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!!Examples

[[foldercontrol]]

[[folder:Anime and Manga]]
* ''Anime/AgentAika'' has ''modern'' underwater ruins from when the sea levels rose and flooded coastal cities.
* ''Anime/NeonGenesisEvangelion'' has ''[[RuinsOfTheModernAge modern]]'' underwater ruins from when the sea levels rose and flooded coastal cities.
* Appears in ''TransformersArmada''. It's Atlantis, and was actually destroyed by a plot device.
* Early in ''[[AllThereInTheManual StrikerS Sound Stage X]]'' of the ''LyricalNanoha'' series, Subaru mentions an underwater ruin that was uncovered when the [[AmusementPark Marine Garden]] was being built. It could be seen from the Crystal Valley underwater tunnel. It's really romantic, the color's really blue and very beautiful, [[spoiler:and it becomes very important later as it turns out that the [[KingInTheMountain Dark King Ixpellia is sleeping there]]]].
* ''BlueSubmarineNo6'' shows the flooded ruins of Tokyo at the beginning of the first episode and has even a underwater submarine battle around them in second one.
* In ''Franchise/LupinIII'':
** ''Anime/TheCastleOfCagliostro'': [[spoiler:these turn out to be the treasure of the Cagliostro country.]]
** ''Anime/LupinIIIElusiveness OfFog'': Exploring the ruined tower at the beginning of the movie also helps Lupin figure out what he has to do in the past.

[[/folder]]

[[folder:Film]]
* ''Film/AIArtificialIntelligence'' had underwater ruins of the submerged parts of New York City.
* There was some of this in the Film/JamesBond film ''Film/ForYourEyesOnly.'' Not much, the "underwater" set wasn't particularly elaborate, but it was implied.
* Kevin Costner's ''Film/{{Waterworld}}'' had underwater ruins... which turn out to be the city of Denver.
* In the Black Lake during the second task in ''Film/HarryPotterAndTheGobletOfFire'', there's ruins of the underwater [[OurMermaidsAreDifferent mermaid]] city.
[[/folder]]

[[folder:Literature]]
* In Creator/JulesVerne's ''Literature/TwentyThousandLeaguesUnderTheSea'', the ruins of {{Atlantis}}.
* Creator/HPLovecraft's "Literature/TheColourOutOfSpace" takes place in a region of Massachusetts which is eventually flooded to create a reservoir. Several homesteads and small towns end up submerged, including the [[StarfishAliens Colour]]-infested farm. (Minus the Colour, this is TruthInTelevision, as the Quabbin Reservoir was created in this manner.)
** However, there are no ruins in the Quabbin -- well, except for the odd basement here and there -- they knocked down the buildings first.
** Not to mention most of R'lyeh, where the [[Franchise/CthulhuMythos titular]] Cthulhu lives.
** ''Literature/TheTemple'' deals with the crew of a submarine who encounter some.
* Subverted in Terry Pratchett's ''Discworld/{{Jingo}}'', where it turns out that the ornate ruins on the ascended isle of Leshp [[spoiler: were constructed underwater by Curious Squid, not above-water by people]].
* Underwater Ruins were the source of the outbreak in ''WorldWarZ''. Patient Zero was a boy who had been diving for valuables with his father in the drowned township at the bottom of a Chinese reservoir. He returned to the surface with a bite wound and a death sentence for a large proportion of the human race, and his father never returned at all. It is implied by the authorities' reaction that the reservoir was created in the first place to attempt to cover up the (probably bioweapons) site.
* ''{{Dinotopia}}'' by James Gurney has the ruins of Poseidos (read: Atlantis).
* Lael Littke's short story ''Lucinda'' in ''Thirteen'' concerns the disappearance of the aforementioned Lucinda six years prior to the story's beginning. It's believed that Lucinda's body was hidden in the remains of what used to her hometown, Lake Isadora, after the buildings were moved and the remaining foundations flooded to create the new lake. The main character and her brother (Lucinda's ex-boyfriend) return to the lake after it had dried up.
[[/folder]]

[[folder:Tabletop Games]]
* A few blue-related ''TabletopGame/MagicTheGathering'' cards feature these, including the Land card Academy Ruins, pictured above.
[[/folder]]

[[folder:Video Games]]
* ''AceCombat04ShatteredSkies'' provides a more modern example. Your enemy's capital city, Farbanti, has a submerged downtown full of scorched, tilted skyscrapers (and during the battle, submarines) due to an asteroid impact.
* In addition to your standard underwater caves and shipwrecks, Edward Kenway in ''AssassinsCreedIVBlackFlag'' can use a diving bell to explore some underwater ruins in the West Indies Sea, primarily Mayan in origin. Some other ruins in the overworld are also partially submerged.
* ''VideoGame/BlasterMaster'' - The underwater world of Level 5 has some "Atlantis" like pillars for background.
* In ''VideoGame/{{Banjo|-Kazooie}}-Tooie'', the Atlantis section of Jolly Roger's Lagoon.
* Given the amount of damage it's suffered after a genocidal civil war, Rapture of ''Franchise/BioShock'' fame probably counts, even if it thankfully hasn't flooded yet.
** In the sequel, as you're a Big Daddy in a self-contained suit, you supposedly can go outside and see what it's like from without.
* ''DemonsCrest'' had one level that was split into above-water ruins and underwater ruins. By playing through the above-water section, you could acquire the Crest of Water, which gave you a form that lacked SuperDrowningSkills and let you complete the underwater section.
* ''[[VideoGame/DonkeyKongCountry Donkey Kong Land]]''
* ''EccoTheDolphin'', played to the letter.
* ''VideoGame/TheElderScrollsIIIMorrowind'' had a secret Dwemer ruin some distance offshore, with a few interesting, entertaining or useful items inside it.
* ''VideoGame/TheElderScrollsIVOblivion'' expansion Knights of the Nine'' adds an underwater Ayleid ruin where one of the artifacts was stored. For being underwater for so long, it still has a good amount of breathable air.
* ''VideoGame/EndlessOcean'' has one as a bonus area.
** The sequel has some as ''regular'' areas.
* In ''VideoGame/FinalFantasyI'', the Underwater Temple, home to one of the game's [[CosmicKeystone Cosmic Keystones]]. You can apparently breathe there, too, thanks to [[spoiler:some AppliedPhlebotinum called oxyale]].
* In ''VideoGame/FinalFantasyIII'', There's the Temple of Time near the continent of Saronia, underwater.
* In ''VideoGame/FinalFantasyX'', these crop up quite a bit. Able to be explored because three of the main characters seem to be able to hold their breath indefinitely (justified because two of them play underwater sports for a living and the latter is a thief).
* The Lost Precursor City in ''VideoGame/JakAndDaxterThePrecursorLegacy''.
* In ''VideoGame/{{La-Mulana}}'', The Spring In The Sky, in which you had to swim ''through'' the water (thus, deliberately take damage) to get the underwater breathing item.
* ''VideoGame/MetroidPrime'' features the ruins of the frigate from the beginning of the game about 3/4 submerged in water (accompanied by [[CrowningMusicOfAwesome a beautiful piano song]]).
** In the sequel, the lower part of Torvus - a ruined, sunken temple, with a remix of Red Brinstar from Super Metroid. Dark Aether's version doesn't have nearly as much water, but is MUCH creepier and even more derelict.
** The Wrecked Ship in Super Metroid is similar to Prime's, except without the awesome music.
* ''{{Ristar}}'' has ALL of Planet Undertow like this.
* The ''SonicTheHedgehog'' series seems fond of this:
** Labyrinth Zone (''VideoGame/SonicTheHedgehog'')
** Aquatic Ruin (''VideoGame/SonicTheHedgehog2'', Genesis)
** Aqua Lake (''Sonic 2'', Game Gear)
** Aqua Planet (''SonicChaos'')
** Hydrocity (''VideoGame/{{Sonic 3|AndKnuckles}}'')
** Tidal Tempest (''SonicCD'')
** Lost World (''VideoGame/SonicAdventure'')
** Aquatic Mine (''VideoGame/SonicAdventure2'')
** Water Palace and Pirates' Island, the latter of which being built into a base. (''VideoGame/SonicRushSeries'')
** ''VideoGame/SonicGenerations'' features both {{VideoGame/S|onicHeroes}}easide [[NostalgiaLevel Hill]] in the console version, which has been retooled to be partially underwater, unlike the original level, and the above [[VideoGame/SonicRushSeries Water Palace]] in the 3DS version, with a few added gimmicks for Act 1.
* ''VideoGame/StarFox64'''s Aquas, which was a once-thriving planet before a bioweapon (the stage's boss) submerged the entire planet underwater. The ruins from the previous inhabitants are still present, though limited mostly to pillars that act as magnets to your torpedoes.
* In ''VideoGame/WorldOfWarcraft'', the sheer number of elven ruins in Ashenvale and Azhara is staggering; there is nary a body of water in these zones without a downed column, sunken arch, or pockmarked pillar in it. Massive earthquakes are to blame for all those night elf ruins underwater. Though they seem remarkably resistant to pressure and the ravages of 10,000 years. There are also ruins of a sunken Troll city off the coast of Stranglethorn Vale and sunken Titan ruins in the waters between Arathi and Wetlands.
** Another example from the ''Warcraft'' universe: the Tomb of Sargeras. Heck, the terrain type that was used to make these maps for ''The Frozen Throne'' is ''named'' 'Sunken Ruins' in the editor.
*** Should be pointed out that by the time we encounter any of the 'Sunken Ruins' locations in TFT, they've been raised from the ocean floor.
** ''Cataclysm'' has the Sunken City of Vashj'ir and the town of Duskhaven in Gilneas, which gets flooded during the Worgen Starting zone because of the cataclysm.
* ''VideoGame/WarioLandII'' had the very aptly named "Ruins at the Bottom of the Sea" as a secret world/level.
* In ''{{X-COM}}: Terror From The Deep'', you shot down alien craft all over the world, then went to capture or kill them. This happened around underwater ruins an awful lot. The Atlateans must have had a global civilization.
** A similar example from the same game. Occasionally, later in the game, the aliens will attempt to capture "Artefact Sites" in order to expand the range of their [[HiveMind Molecular Control network]]. These sites are beneath ancient pyramid structures, and have a UsedFuture architecture.
* In ''VideoGame/TheLegendOfZeldaTheWindWaker'', [[spoiler:the old kingdom of Hyrule gets submerged underwater]].
* ''[[GaiaOnline zOMG!]]'' features ruins of [[ContinuityNod Gambino's Tower]] as a major part of the Undersea Cliffs, and as a portion of the [[spoiler:[=SeaLab=] Compound zone]]
* Atlantis sank at the end of the campaign in ''VideoGame/AgeOfMythology'', but you end up having to go back in the expansion. It just hasn't sunk ''very far'' yet, so there are a lot of ruins that are just under the surface, and a lot of areas shallow enough to wade through.
* ''VideoGame/InTheHunt'' has a stage like this where your submarine is [[RiseToTheChallenge chased upwards]] by a [[AdvancingWallOfDoom giant living statue]].
* ''IndianaJonesAndTheFateOfAtlantis'', unsurprisingly enough.
* The underwater indie game ''VideoGame/{{Aquaria}}'' naturally has a lot of these, mostly acting as dungeons.
* Centaur Man's stage in ''VideoGame/MegaMan6''.
* Slimy Spring Galaxy in ''VideoGame/SuperMarioGalaxy2''.
* ''PanzerDragoonSaga'' has the ruins of Uru - you and your dragon fly over what few bits are tall enough to poke out of the water, then you wind up temporarily losing said dragon and explore a vast underwater laboratory.
* ''VideoGame/AmericanMcGeesAlice'' has the Vale of Tears. It's an UnderTheSea level with Underwater Ruins.
* In ''VideoGame/PokemonBlackAndWhite'', there's the underwater Abyssal Ruins by Undella Bay.
* ''VideoGame/TalesOfPhantasia'' features Thor, a technologically advanced city that sunk into the sea 2 millennia ago when a meteor struck it. [[RagnarokProofing Being over 2000 years underwater]] hasn't stopped most of the technology thanks to the city being powered by [[CapturedSuperEntity Aska]], who also keeps the city's dome under which the party can freely breath.
* ''VideoGame/ResidentEvilRevelations'': [[spoiler:the Queen Dido]]
* In ''VideoGame/PhantasyStarIII'' one NPC points out an underwater temple to you when you pass by it on a boat ride to an early quest, but it's not until near the end of the game that you actually get to go there with the help of a TransformingMecha to get [[SwordOfPlotAdvancement Orakio's]] [[InfinityMinusOneSword Sword]].
[[/folder]]

[[folder:Web Comics]]
* ''Webcomic/EightBitTheater'': [[MacGuffin the Orb of Water]] is located in the Sunken Shrine. It's inhabited by a [[HPLovecraft Lovecraftian]] ApocalypseCult. In the end, [[spoiler:the heroes end up raising the Shrine back on surface [[DestructiveSavior flooding the town of Onrac in the process]]]].
* In ''Webcomic/DemonFist'', [[InfinityPlusOneSword Pandora's Spear]] is located in a sunken ruin. In an aversion of the usual dry-inside or aquatic-level tropes, Rosenquist's floating fortress actually uses a giant forcefield to part the sea around the whole city, leaving it high and dry.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/{{Futurama}}'' has the lost city of [[{{Atlantis}} Atlanta, GA]].
* Little-known film ''WesternAnimation/SamsonAndSally'' had brief references to Atlantis. Later in the film, Samson (a whale - most characters were marine animals) traveled to "the city man built" in order to find Moby Dick. This city is apparently a sunken New York.
* In ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' Billy inadvertently destroys Atlantis.
* Similarly, Cosmo of ''WesternAnimation/TheFairlyOddParents'' sunk Atlantis… seven or eight times. Eventually the residents just gave up on living on the surface and evolved into mer-people. When Timmy wishes to visit Atlantis (to get cool pictures for a school history report or something), he ends up having to rescue Cosmo from their revenge/justice by proving they were actually better off safe and secluded under the ocean.
* The sunken island of Quetso in ''FlipperAndLopaka''.
* The town of Moose Creek from ''WesternAnimation/ScoobyDooCampScare'' -- though it gets dried up by the bad guys.
* In ''Disney/AtlantisTheLostEmpire'', the titular kingdom's capital is protected by a massive air bubble but the outskirts are exposed to the ocean and in ruins.

[[/folder]]

[[folder:Real Life]]
* In the UK, entire towns have been submerged over the years for various reasons.
* Subversion: Venice. It's building dikes and other such anti-flooding devices, since the entire city is slowly ''sinking into the ocean'' because it's so heavy that the land underneath (formerly marsh, so that's understandable) can't hold up its weight.
* As with the U.K., Italy has its share of submerged towns. One in particular is situated in a lake that gets drained periodically, allowing the interested to go visit.
* A few have been found in real life, such as the Yonaguni Monument and temples of Mahabalipuram, but they are rarely more than a few sunken structures.
* Similarly to the Quabbin Reservoir example (Literature), many towns along the Tennessee River were flooded by the construction of hydroelectric dams. Most of the buildings were demolished, but divers can still see the foundations of some.
* Many of the most ancient parts of Alexandria, in Egypt, have sunken along with the land under them.
* Look at the footage of UsefulNotes/RMSTitanic's interiors sometime (YouTube is just lousy with pirated documentaries). Even amongst the wreckage and ruin brought on by the sinking and a century under the waves, glimpses of the once grand glory can still be seen.
* The hydroelectric dams built on the Upper Nile have flooded, and most likely destroyed, a great many archaeological sites of the ancient Egyptian and Nubian civilizations.
* OlderThanDirt: The oldest known sunken town is [[http://en.wikipedia.org/wiki/Pavlopetri Pavlopetri]] in Greece, which was inhabited during the bronze age and is thought to have sunk around 1000 BCE.
** Areas around the Black Sea are dotted with sunken ruins. Some archeologists have speculated that the Black Sea may originally have been a lake with surfaces well below sea level that got flooded with seawater when it got connected with the Mediterranean.
* ThatOtherWiki has a list of real sunken ruins [[http://en.wikipedia.org/wiki/Category:Underwater_ruins here.]]
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