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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.
Types of underwater welding. 1  Pressure welding: the work is done by the welder in a pressure vessel measuring 1 atmospheric unit of pressure. 2  Habitat welding: Chamber in used in ambient pressure ,approximately the size of a small room to weld. Before entering, the chamber displaces its water into ocean or lake. more information...