Deep Aquarium

The Deep Aquarium is a cave in Treetop Valley in Pikmin 2... Again?. It is unique among other caves for being completely flooded with water. Many sublevels are large, all with aquatic enemies, some appearing exclusively in this cave. Because of the cave's nature, only Blue Pikmin can be brought in, all other Pikmin remaining on the surface and returning to their Onions. Aside from water, the only other hazard present in the environment is poisonous bubbles, which can only be avoided.