Alien Containment (Subnautica)

The Water Park is a large, circular aquarium which can house fauna acquired by the player. It is built from the Builder inside of rooms. To increase the height of a Water Park, place another room directly on top of the Water Park room and place another Water Park inside of it.

In order to get inside of or put fish into the Water Park, the player must build a hatch on the side. The player can then enter the Water Park and release caught fish into it.

If you leave two creatures inside the Water Park for long enough, they will breed and another fish of the same species will spawn inside. Once the Water Park reaches a population of 10 fish, they will stop reproducing.