History Main / UnderwaterBossBattle

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* ''VideoGame/AndroDunos 2'' have the battle against the mechanical leviathan, set underneath a sunken city and the only boss fought underwater.

* ''VideoGame/SonicTheHedgehog'':
** ''Videogame/SonicTheHedgehog1'': The Game Gear/Master System version, unlike the Genesis/Mega-Drive version, had its Labyrinth Zone boss fight completely underwater. [[OneHitKill And there were no rings.]] The game ''was'' kind enough to turn off drowning during that fight.

** ''VideoGame/SonicRushSeries'': The Water Palace with Eggman's Egg Turtle is an example where you actually can't drown, though occasionally the water level will drop.

* ''VideoGame/{{Bug}}'' has [[UnderTheSea Quaria's]] boss, a giant octopus who throws dogfish (fish with dog heads and collars) at Bug, who has to swat them back with a tennis racket. While the whole world is underwater, the physics in the level are exactly the same as on dry land.

* Both entries of the ''VideoGame/OrientalLegend'' have levels set underwater, including boss fights. The first game notably sees you battling a submarine-sized hostile [[SeaHurtchin sea urchin]] who has SpikeShooter abilities.

** ''VideoGame/TheLegendOfZeldaOracleOfAges'' has two. The first of which is Octogon of the sixth dungeon, Mermaid's Cave, where after doing damage to it on dry land, it submerges underwater and you must give chase with the Mermaid Suit to damage him. The second is Plasmarine, the boss of the seventh dungeon, [[WombLevel Jabu-Jabu's Belly]], where his battle takes place entirely underwater after [[TideLevel the water level reaches its maximum point]], and you have to maintain a safe distance from it and use the Switch Hook to trade places with it when it fires a ball of lightning at you, [[HoistByHisOwnPetard causing it to be hit by its own attack]]. The Angler Fish returns to serve as the mid-boss of the latter dungeon, although even though the background suggests that you're underwater you control Link as if you were on land.

** ''VideoGame/TheLegendOfZeldaOracleOfAges'' has two. The first of which is Octogon of the sixth dungeon, Mermaid's Cave, where after doing damage to it on dry land, you must follow it underwater to damage him. The second is Plasmarine, the boss of the seventh dungeon, [[WombLevel Jabu-Jabu's Belly]], where you have to maintain a safe distance from it and use the Switch Hook to trade places with it when it fires a ball of lightning at you, [[HoistByHisOwnPetard causing it to be hit by its own attack]]. The Angler Fish returns to serve as the mid-boss of the latter dungeon, although even though the background suggests that you're underwater you control Link as if you were on land.

** ''VideoGame/TheLegendOfZeldaOracleOfAges'' has two. The first of which is Octogon of the sixth dungeon, Mermaid's Cave, where after doing damage to it on dry land, you must follow it underwater to damage him. The second is Plasmarine, the boss of the seventh dungeon, [[WombLevel Jabu-Jabu's Belly]]. The Angler Fish returns to serve as the mid-boss of the latter dungeon, although even though the background suggests that you're underwater you control Link as if you were on land.

** ''VideoGame/FinalFantasyVII'' has Emerald WEAPON, an [[BonusBoss optional boss]] who hangs out at the bottom of the sea. And you don't even fight him in your submarine. There's also a couple of underwater (though air-containing) areas.
** ''VideoGame/FinalFantasyX'': Sinspawn Echuilles, Geosgaeno and Evrae Altana. Shinryu, one of ''Final Fantasy''[='=]s two recurring {{Bonus Boss}}es, is an UndergroundMonkey of Evrae Altana. All of these battles restrict you to the only three party members[[note]]in Echuilles' case, only two, since the third hasn't joined your group yet at that point[[/note]] who can fight underwater: two blitzball players and one salvager.

** ''VideoGame/TheLegendOfZeldaOracleOfAges'': Plasmarine, the boss of the seventh dungeon, is fought underwater. The Angler Fish returns to serve as the mid-boss of this level, although even though the background suggests that you're underwater you control Link as if you were on land.

** The Lakebed Temple features one, naturally enough. The first phase is on the floor of the deepest point of the dungeon, fought against the tentacles of the boss that emerge from the and. In the second phase, it emerges from the sand and starts swimming around, pulling you into its maw with a whirlpool if you get too close. The key to beating it is to hookshot yourself to the eye on its back and stab away.
** One of Zant's boss phases teleports you back down there, where he hides in one of three enormous copies of his helmet.

* ''VideoGame/EtrianOdysseyIIITheDrownedCity'': Since the entirety of Undersea Grotto (the second stratum) takes place beneath the ocean of Armoroad, the resident main boss (Ketos, a sacred whale) is accordingly challenged this way. The player's characters have SuperNotDrowningSkills, so the difficulty of the battle is based on the variety of attacks Ketos can use (including a party-wide attack that can cause strong damage but has low accuracy). The boss returns in ''VideoGame/EtrianOdysseyNexus'', fought once again [[NostalgiaLevel on the same stratum]].

* ''VideoGame/EtrianOdyssey'': Since the entirety of Undersea Grotto (the second stratum) takes place beneath the ocean of Armoroad, the resident main boss (Ketos, a sacred whale) is accordingly challenged this way. The player's characters have SuperNotDrowningSkills, so the difficulty of the battle is based on the variety of attacks Ketos can use (including a party-wide attack that can cause strong damage but has low accuracy). The boss returns in ''Nexus'', fought once again [[NostalgiaLevel on the same stratum]].