lizardland
Registered
A rebreather brings its own issues. If you're in a situation where you can't see the way out then what do you do when you can't see your ppo2? SCR your way out? Just pray that whatever O2 addition system you're using will keep up while you're blind? (A level of faith most of us aren't willing to accept in normal circumstances)That and a rebreather providing ‘unlimited’ gas to keep the lizard brain at bay.
Not so much an issue in wrecks but clay in a cave will turn the water to soup. I've been in many a sump where a misplaced fin will make you think someone has just poured brown paint over your mask.