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I believe the pressure under 300' of water is in the neighborhood of 150 psi. At that depth, the diver is of course dependent on the air supply. Air is probably supplied from the surface. There is an air pump on the boat, supplying air. If something were to happen, getting the diver to the surface is not one of the options. A quick rise to the surface would kill the diver.
So yeah. Diving is done in an inhospitable environment. To say the least.
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