My wife and I love to go scuba diving. We usually use a rebreather too so we can extend the time underwater
My wife and I do as well, we really enjoy diving in Hawaii.  Where have you gone diving before?
We've been cave diving in some water-filled caves in Costa Rica!
Cave diving seems especially risky, I bet it's quite thrilling!
Yeah.. it's an extreme sport because it can be dangerous. It' commonly done for scientific reason too because it's a whole new world.