The Brain Coral has a purple, hemispheric body. The bubbles are released from the circular protrusions with green holes in them that cover the body of the Brain Coral.
The fact that the Brain Coral spawns in caves is very helpful and in some cases life-saving, as it spawns three oxygen bubbles at a time, filling up the player's oxygen level by a total of 30 points. If a Brain Coral is picked up with the Propulsion Cannon, it can be used as a portable source of oxygen, although this method is rather unconventional.
Brain Corals produce bubbles during both the day and the night.
Data Bank Entry
A permanent, growing colony of microscopic organisms. This coral species has adapted to filter carbon dioxide from the environment, using the carbon to build the colony, and expelling the oxygen from specialized exhaust funnels. It is quite hardy, suggesting samples from a mature specimen could be grown artificially.
Assessment: Air tanks are equipped to siphon oxygen from the water where possible