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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.
Military diving covers all types of diving carried out by military personnel. There are a number of different specialisations for a military diver to choose; some depend on which branch of the military they have joined or where the military needs more divers.