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!
Cave diving
Cave diving is underwater diving in water-filled caves. It may be done as an extreme sport, a way of exploring flooded caves for scientific investigation, or for the search for and recovery of divers lost while diving for one of these reasons. The equipment used varies depending on the circumstances, and ranges from breath hold to surface supplied, but almost all cave diving is done using scuba equipment, often in specialised configurations with redundancies such as sidemount or backmounted twinset. Recreational cave diving is generally considered to
the specific environment.
Despite these risks, water-filled caves attract scuba divers, cavers, and speleologists due to their often unexplored nature, and present divers with a technical diving challenge. Underwater caves have a wide range of physical features, and can contain fauna not found elsewhere.
Procedures.
The procedures of cave diving have much in common with procedures used for other types of penetration diving. They differ from open water procedures mainly in the emphasis on navigation, gas management, operating in confined spaces, and