Manatees manage their buoyancy through consistent farting. I wish I knew that trick when I was scuba diving
https://dcmp.org/media/16639-can-manatees-control-their-buoyancy-by-farting
Can Manatees Control Their Buoyancy by Farting?
Scientific evidence exists that manatees can regulate their underwater buoyancy by expelling gas. This helps them control their rise and fall while underwater.dcmp.org