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.
It really is, there's a lot to be learned from cave diving.  New species, cave drawings, ancient burial sites and more.  Pretty great stuff.
National Association for Cave Diving
The National Association for Cave Diving (NACD) was founded in 1968 with the goal of improving the safety of scuba diving in caves through training and education. A non-profit corporation, the NACD has its headquarters in Gainesville, Florida but is conducting its administration and operations from High Springs, Florida.
NACD offers training courses and certification in cavern and cave diving, and instructor courses. As part of its mission to raise safety standards in cave diving, the NACD publishes a quarterly journal
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