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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.
Wet underwater welding. In âwetâ underwater welding, MMA, or manual arc welding is the most common method. This is a variation of shielded metal arc welding, which employs a waterproof electrode. The other common processes in use are friction welding and flux-cored arc welding.