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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.
while a less intensive kind of diving called cavern diving does not take divers beyond the reach of natural light and typically no deeper than 100 ft and penetration not further than 200 ft true cave diving can involve penetrations of many thousands of feet well beyond the reach of sunlight