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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.
There are ethnic groups around the world who have relied on diving to get food. Some of these humans can stay underwater for a very long time, he said. Diving mammals, such as this Galapagos sea lion, evolved adaptations allowing them to stay underwater for prolonged periods of time.