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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.
5 Longest Free Dives of All Time. As far as extreme sports go, free diving is among the most challenging. Divers push the limits of human evolution by descending hundreds of meters below the surface, fighting massive levels of water pressure and minutes without oxygen.