Deep Aquarium

The Deep Aquarium is a cave. It is unique among the other caves for being in totally filled with water and most sublevels are large, with all aquatic enemies, some exclusive from this cave. The only non-enemy hazard in this case is are poison in form of bubbles around the water, which must be avoided for White Pikmin being unable to get there specially based they can't survive water. Due to being entirely of water, Blue Pikmin are required, any non-Blue Pikmin when trying to get in the cave won't go along instead being back to their Onion due to if it happened they would drown in there.