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no
From a regulator attached to a scuba tank.
hell no :|
seriously? it is not diving and you don't scuba to breath in air.
No you can't it's too dangerous
from holding their breath and ascending.
With SCUBA gear, yes. Without it, no.
so they can breath underwater
So that they may breath underwater.
so the diver can breath.
Free divers do but scuba divers do not need to. Scuba divers take their air with them and would have no need to hyperventilate.
breath without life support. :)