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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.
Though all turtles breathe air, aquatic turtles such as sliders (Trachemys scripta) and painted turtles (Chrysemys picta) can stay underwater for quite some time. Because of their slow metabolisms and adaptations for extracting oxygen from the water, some species can even spend the entire winter underwater.