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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.
SCUBA diving can be used for recreational purposes where divers can explore wrecks or reefs or marine life. Diving can also be used in a commercial setting by engineers for exâ¦ample who carry out construction and maintenance tasks underwater.