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Underwater diving is the practice of descending below the water's surface to conduct underwater activities. In ambient pressure diving, the diver is exposed to the pressure of the surrounding water, and uses breathing apparatus for scuba diving or surface supplied diving, or when freediving, will breath-hold. The saturation diving technique reduces the risk of decompression sickness after long duration deep dives.
cave diving is one of the most challenging and potentially dangerous kinds of diving or caving and presents many hazards cave diving is a form of penetration diving meaning that in an emergency a diver cannot swim vertically to the surface due to the cave s ceilings and so must swim the entire way back out