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I’m not super well versed with diving, but wouldn’t the excess pressure and air just go out the bottom of the helmet? it’s open to the water below, similar to shallow-water helmets, which are used by untrained tourists.
I’m not super well versed with diving, but wouldn’t the excess pressure and air just go out the bottom of the helmet? it’s open to the water below, similar to shallow-water helmets, which are used by untrained tourists.