It's important to remember that cave divers carry redundant equipment which means that for every piece of equipment they carry, an additional will come along for the dive. This really is to make sure that if something undergoes failure, there is a replacement to take over and permit a safe return to the surface. It may be something seemingly unimportant as an extra mask, or a device that ensures a diver's survival, as an oxygen tank.
Cave divers use either dry suits or wet suits for defense. Suits are most important cave diving equipment. The difference between the two kinds of suits is the fact that dry suits are designed to seal off water from entering and becoming a diver's body wet. Made from a synthetic rubber called neoprene, dry suits would be the preferred choice for cave divers simply because they allow much less heat loss. The fabric is double-layered with a small space among for insulating air, and divers have the choice of wearing extra undergarments. Wet suits will still suffice for shorter dives and warmer waters, however.
While open water cave diving divers usually use snorkels simply because they can easily reach the surface for air, cave divers could never manage to bring one along and also have no use for it. Cave divers stay submerged within the water for long periods of time, and therefore take along oxygen tanks for breathing purposes - a snorkel would only create excess weight and additional drag.
Cave divers typically prefer black rubber fins, and ones that are not very flexible. Light, stiff fins perform best because divers already so carry much mass together into a cave. Moving with the water, they need to use short, controlled kicks to prevent stirring up any sediment on the ground of a cave.
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