[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/LAqurium_6360.jpg]]

-> Ax said approvingly. \\
"Ax? It's not a hologram," Rachel said.\\
\\
"Yeah."\\

-->--''{{Literature/Animorphs}} 15: The Escape''

A {{Video Game Setting|s}} consisting of an underwater tunnel with glass walls. Expect to see all sorts of fish and aquatic life on the other side of the glass. Actual sharks are common, but not required.

TruthInTelevision, as underwater tunnels are [[https://en.wikipedia.org/wiki/Shark_tunnel very popular features]] in aquariums worldwide, and more often than not are actually stocked with a few reef sharks as part of the ecosystem in the tank the tunnel runs through.

These are especially common in {{Racing Game}}s as a {{Justified|Trope}} UnderTheSea race course.

Compare UnderTheSea and DownTheDrain.

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!!Examples:

[[foldercontrol]]

[[folder:Adventure Game]]
* The minecart in ''VideoGame/{{Riven}}'' goes through one on its way from Jungle to Crater Island. Later, there's the underwater viewing room on Survey Island.
* In ''VideoGame/{{Subnautica}}'', you can build these as part of your [[AHomeOwnerIsYou undersea base]]. They're not good for the base's structural integrity but they look cool.
[[/folder]]

[[folder:Action-Adventure]]
* In ''VideoGame/SuperMetroid'', Brinstar has a section where it crosses over Maridia, where a short glass tube separates them. A well placed Power Bomb shatters the glass, allowing more free travel between the two. As a CallForward, ''VideoGame/MetroidZeroMission''[='=]s expanded endgame features a similar (albeit not underwater) glass tube connecting [[spoiler:the Space Pirate Mothership and the ruins of the temple in Chozodia]], which can also be shattered with a Power Bomb [[spoiler:after you've reacquired your power suit from the temple]] to open a way back to the rest of Zebes.
* It makes an appearance in ''VideoGame/Onimusha2SamuraisDestiny'' and ''VideoGame/Onimusha3DemonSiege''. In the former, if you stand still near the glass and absorb souls for a while, a large shark will appear and chomp a school of smaller fish, giving you yellow souls.
* ''VideoGame/JawsUnleashed'': Yes, the protagonist is on the outside of the tunnel.
* ''VideoGame/MediEvil'' has The Lake, in which you walk through a tunnel of water, [[ItMakesSenseInContext magically frozen in place by crystals]]. Outside are [[MakesJustAsMuchSenseInContext huge, blue elephant fish]], which constantly trumpet as they swim around.
* Doctor Octopus's lair in ''VideoGame/SpiderMan2000''.
[[/folder]]

[[folder:First-Person Shooter]]
* ''VideoGame/HalfLifeOpposingForce'' has these in the "Crush Depth" level.
* ''VideoGame/BioShock1'' has a lot of these tunnels linking the habitats of Rapture, with one tunnel featured early-on in an impressive [[VideoGameSetPiece set-piece]] where a wrecked plane crashes into the tunnel and starts flooding it.
* At least one level of ''VideoGame/JediKnightMysteriesOfTheSith'' features one, only with [[DemonicSpider Drugons]]. Oh, and you are in the pool with them and must find your way inside in order to proceed.
* ''VideoGame/ShadowWarrior1997'' has this as part of the undersea enemy base in the "Water Torture" level. You first see it from the outside as you dive into the waters, and later get to walk through it.
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[[folder:MMORPG]]
* ''VideoGame/WorldOfWarcraft'' has one of these, albeit as a mode of transportation and not an actual combat zone, called the Deeprun Tram.
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[[folder:Platform Game]]
* ''VideoGame/EarthwormJim'': While its name suggests a DownTheDrain level, the Down The Tubes level is very much a Shark Tunnel.
%%* In the first level of ''VideoGame/Gimmick1992''
%%* ''VideoGame/{{Pulseman}}'': The Australia level of Pulseman has a part like this.
* ''VideoGame/SonicColors'': In the Wii version, Sonic goes through such a tunnel at the very beginning of Aquarium Park Act 1. This is because Aquarium Park is set underneath a series of massive interconnected undersea geodesic domes. Sonic arrived from the surface of the water. The DS version does not have such a thing, immediately starting Sonic underneath the domes.
* ''VideoGame/SonicLostWorld'': In the Wii U version, Tropical Coast Act 3 and Lava Mountain Act 2 are set entirely in an underwater tunnel. Also combined with MinecartMadness due to Sonic grinding on rails for almost the entirety of both stages and the presence of minecarts transporting gold and, for some reason, active bombs.
* ''WesternAnimation/DuckDodgersInTheTwentyFourthAndAHalfCentury'' for the Platform/SuperNintendo has the second world being UnderTheSea with a combination of UnderwaterRuins, laboratories and interconnecting... well, this trope.
* ''VideoGame/JakAndDaxterThePrecursorLegacy'': The Lost Precursor City is a highly-advanced underwater facility accessed via an evelator found in Rock Village (which itself is found in a coast), and whose glass windows let one see the sea the place is installed several meters under. Despite being overrun by monsters and no longer maintained by its original builders, its machinery remains fully functional, though it has many dangerous obstacles like a big pool of dark Eco and electrified water. It also has timed puzzles that require working around difficult platforming.
%%* [[SingleBiomePlanet Planet Aquatos]] from ''VideoGame/RatchetAndClankUpYourArsenal''.
[[/folder]]

[[folder:Racing Game]]
* In ''VideoGame/StarWarsEpisodeIRacer'', the Aquilaris track has these linking the various floating cities.
* The Beginner course in ''Scud Race / Sega Super GT'' has two of these, the first of which is called the "Dolphin Tunnel".
* Big Blue 1 in ''VideoGame/FZeroGX'', which borrows heavily from ''Scud Race''[='=]s Beginner course, also has an aquarium tunnel.
* ''VideoGame/StuntRaceFX'': Even with the blocky early polygonal graphics, the track Aqua Tunnel has one, with sharks and sunken ships visible.
* ''VideoGame/ExtremeG 2''. It's not surprising that another futuristic racing game has a shark tunnel in it, with the best examples being Aquanor and Hydra Prime.
* ''VideoGame/MarioKartWii'': Koopa Cape track (using giant eels instead of sharks), which was then averted when it reappeared in [[VideoGame/MarioKart7 its successor]] to fit its new underwater-driving gimmick.
* ''VideoGame/RidgeRacer 3D'''s Oceanfront Cruise Way.
* ''VideoGame/{{Megarace}}'': The Maeva tracks take place mostly in underwater glass tunnels.
* ''VideoGame/NeedForSpeedIIIHotPursuit'' has an underwater tunnel on the Aquatica course. There's also the [=PlayStation=] exclusive secret track, Scorpio-7, which is this entirely.
* Roo's Tubes from ''VideoGame/CrashTeamRacing'' and Deep Sea Driving from ''Crash Nitro Kart''
* ''Cruisin' USA'' and its SpiritualSuccessor ''California Speed'' both have a track with this.
* ''[[VideoGame/SegaSuperstars Sonic and Sega All-Stars Racing]]'':
** The "Ocean Ruin" track. It even has a loop-de-loop!
** The sequel has one based on a level from ''VideoGame/BurningRangers''.
* ''[[Videogame/SonicRiders Sonic Free Riders]]'' has one in Dolphin Resort. The earlier game ''Sonic Riders: Zero Gravity'' might have one each in Aquatic Capital and Tempest Waterway, but the camera angles when entering are so bizarre that it's not entirely clear if they're underwater or just in a glass tunnel.
* ''VideoGame/{{Wipeout}} Pulse'''s Vostok Reef.
** Qoron IV in ''64''.
** Vineta K in ''Pure''.
* ''VideoGame/{{Rollcage}} Stage II''.
[[/folder]]

[[folder:Rail Shooter]]
* ''VideoGame/AgentUnderFire'''s tenth level had {{Franchise/James Bond}} riding an open-top tram through a network of underwater tunnels running throughout Malprave Industries' elaborate underwater [[GeneticengineeringIsTheNewNuke cloning research lab]] (known as "Poseidon") in the South China Sea, as Bond must chase down TheDragon, Adrian Malprave's right-hand man [[ImplacableMan Nigel Bloch]].
* ''VideoGame/SinAndPunishment2'''s 3rd stage is one that is pretty much made of nothing more than air that's been "dug" through the ocean.
[[/folder]]

[[folder:Role Playing Game]]
* ''VideoGame/FinalFantasyVII'' has the pathway to the underwater reactor at Junon.
* ''VideoGame/PokemonBlack2AndWhite2'' have the Marine Tube, which runs between Undella town and Humilau City, where you can see various water Pokémon, and in some rare instances you can see Wailord passing over the tunnel.
* ''VideoGame/WildArms4'': The Cerulean Tunnel dungeon is a tunnel that crosses a large river, and has multiple sections with a glass ceiling. Arnaud even lampshades how ineffective it must be compared to, say, just building a bridge. The tunnel is full of marine life-themed monsters and has a SeaMonster for a boss.
[[/folder]]

[[folder:Non-Video Game Examples]]
* ''Literature/{{Animorphs}} 15'': The team ends up in one of these while trying to acquire sharks for their next mission. Ax assumes it's just an enormous screen and is surprised to learn that they're actually surrounded by sharks with only "poorly-made human plastic" protecting them. When they get caught by a Controller, Marco asks Ax "Just how poorly made ''is'' human plastic?" and Ax smashes the glass with his tail-blade.
* ''Film/Jaws3D'' has an underwater tunnel that gets attacked by the shark.
* TruthInTelevision: The original shark tunnel is the one at the ''Shark Encounter'' exhibit, at Ride/SeaWorld of Florida, Orlando.
* In the "Unfinished Business" season of ''Series/TheAmazingRace,'' there's a Roadblock where one member of each team has to dive into a tank of this type in order to find their clue.
* The underwater train stations in ''WesternAnimation/DinosaurTrain''.
* The aquaculture train car in ''Film/{{Snowpiercer}}'' is one huge marine tank with a tunnel through it. There aren't any sharks visible among the fish it houses, but there ''are'' large rays which are at least in the same Class.
* Atlantis resort in Bermuda has a ''waterslide'' that goes through a shark tunnel.
* The Georgia Aquarium in Atlanta has a huge tank with one of these through it; the tank includes several huge rays and sharks, including one of the world's only captive whale sharks, the largest species of fish alive today. It's...kinda creepy when it passes overhead.
* Deep Sea World in North Queensferry, Scotland, has one of the world's longest. The tank is mostly home to species found around the coast of Scotland, but also includes a collection of sand tiger sharks, presumably largely for the [[RuleOfCool coolness factor]].
* The tank at the Oregon Coast Aquarium which used to hold Keiko the killer whale (of ''Film/FreeWilly'' fame) has since been converted into one of these. It hosts only sharks, rays, and bony fish found off the Oregon coast in three separate environments (Orford Reef, Halibut Flats, and Open Seas).
* The Oceanarium in Bournemouth, UK has one of these.
* Some of the larger customized aquariums constructed on Creator/AnimalPlanet's ''Tanked'' have arches or viewing-bubbles that humans can enter to be surrounded by their fish (although usually not sharks).
* Marine World/Africa USA (Now known as Six Flags Discovery Kingdom) in Northern California introduced its iconic [[https://www.sixflags.com/discoverykingdom/attractions/shark-experience Shark Experience]] tunnel in 1992.
* Adventure Aquarium in Camden, NJ has a tunnel going through their Shark Realm exhibit.
* There are various aquatic parks in Asia with underwater tunnels featured as main attractions as well, including S.E.A. Aquarium (Sentosa Island, Singapore), Underwater World (Langkawi Island, Malaysia), and various others in Hong Kong, Japan and Taiwan.
* The world's first aquarium tunnel was in Kelly Tarlton's Underwater World in Auckland, New Zealand in 1985 (the aquarium has since been renamed Kelly Tarlton's Sea Life Aquarium). Since it opened it has exhibited numerous species of sharks and rays.
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