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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.
Basic Breathing Drills. The following basic drills can be used to get familiar with breathing technique in the water. Wear swimming goggles to practice those drills. Drill #1: In shallow water, hold your breath, then crouch down so your head gets under water. Stay in that position for a few seconds, then rise up.