A Different Set of Rules
Cave diving is notoriously unforgiving to those prone to making mistakes. Indeed, the art of cave rescue diving is a limited one in terms of what can be achieved, and the training course in this field is still called Body Recovery. To avoid using these resources, cave divers require as much mental awareness as they can muster. Getting in is easy. Getting out is the important part. Cameras are amazingly complicated instruments, and have the potential to suck the concentration away from divers as they transfix their attention to the mesmerizing caves. A little loss of awareness to obtain the right shot can easily make the little seed of doubt grow huge, and then all hell can break loose. So there are some basic rules.
Learn and get trained to dive, as well as cave dive. Great divers do two things throughout their careers. First, they learn to continually make good decisions. Good decision making is vital. Understand that on the dive the picture comes last, and safety comes first. Always. Secondly, always work at awesome flawless trim, buoyancy and propulsion. This is not reflected in open water diving, as the link to the following article explains. Good technique reduces silting dramatically, and therefore improves picture quality by reducing back scatter. Your pictures in caves are clearer on the way in than on the exit as the percolation from the ceiling produces potential back scatter. Basically, think about what you’re doing. Just because you are cave certified doesn’t make it a good idea to pick up a camera. Learn your craft well first before task loading yourself.