As a cave diver, you can't simply throw a cylinder on your back and swim into a cave to become an awesome cave diver. Instead, you need to prepare specialist gear and more training before you go cave diving.

Firstly, You have to be a collector of both dive torches and cutting tools in a cave. There is no natural light in a dark cave, so you must bring 3 independent dive lights to illuminate. Most cave divers are fond of taking a canister dive light as a primary dive light. OrcaTorch D630 is a popular and powerful light for technical divers. The light delivers up to 4,000 lumens with a 7° super focus beam angle and runs for 5 hours. It can meet all your illumination need in cave diving. 

The lines and the markers are necessary. They are usually triangular ‘arrows’ for showing direction, round or rectangular ‘cookies’ to recognize. Arrows are for the direction to a place where you can breathe, Cookies are personal, it shows only you the way where you came from. When your dive lights fail or sediment is stirred up, they can serve to get out of the cave in case of zero visibility. Cave divers can recognize out their markers and lines because they are trained to get out by touch before. So you must recognize yours. if in an emergency exit situation you mistake another marker for your own and head in the wrong direction, you can imagine what might happen!

Believe it or not, Side mount diving is more and more popular among cool cave divers. If you want to get in lots of caves in a twin set, maybe side mount cylinders are better for you. You will be more compressed and flexible to squeeze through the tight gaps by side mounting your cylinders. 

Last but not least, your hoses need to be the right length, so need custom lengths to fit you. 

Besides, when you are in trouble while cave diving, remember to be calm to find a way to go out.