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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.
After completing Second Class Dive School, the member will be assigned to one of the Navy Diver Units to hone the undersea diving and salvage skills required by the United States Navy. A Navy Diver can perform underwater ship repair, salvage, and construction, using either SCUBA equipment or a surface-supplied-air diving system.