A diving regulator in is the component held by the mouth that allows air to enter (or special mix) breathing in the lungs .
The " snorkel (snorkel ) (a tube that allows breathing even when the head is submerged just below the water surface) can not breathe at several meters depth, and this is in fact impossible because of environmental pressure that compresses the body. It is therefore necessary compressed air at the same pressure (at least) of the Environmental to allow breathing without fatigue.
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