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To fit more in. If it was at 1 atmosphere of pressure it would be like breathing out of a bag. (You would run out of air in about 5 or 6 breaths) Addendum: I should add that it's not oxygen in Scuba tanks; it's air. Oxygen when delivered under pressure, can cause convulsions. You'll never see a diver with oxygen in her tanks.

The above is correct, however oxygen is used by technical divers during decompression at very shallow depths. But this is not what is in the divers main gas or bottom gas.

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