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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.
Recreational diving is defined as: Type of diving that uses SCUBA equipment for the purpose for leisure and enjoyment. Most important there are certain depth limits and time limits imposed by different certifying agencies in order to make recreational diving safe.