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Aquarium is a stage that appears in Dead or Alive 2 Ultimate.
Similar to the Aqua Palace in Dead or Alive 3, the Aquarium is a large, underwater dome with glass walls and ceiling. A variety of aquatic animals, such as sharks, fish and dolphins, can be seen swimming in the sea on the other side of the glass, as well as a submerged sea-wreck, coral reefs and ancient ruins.
Despite there being a set of red-carpeted steps leading out of the aquarium, it is impossible to move out of the main room, so the fighters must stay within the dome.