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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.
Mixed Gas Diving is an alternative to diving with compressed air. Thereby oxygen poisoning, which is imminent with compressed air cylinders at great depths, is not possible. In order to enable deeper diving and to prevent a so-called rapture of the deep, there are gas mixtures.