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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.
Different species of whales dive to different depths, but one of the deepest divers is the Sperm whale which can dive more than 1km and even 3kms in search of food. The beaked whales are also good divers. Some are able to dive to at least 1km.