[Bloody Sam Roberts]

The only problem I see from the description is that humans breathe air (21% oxygen)....not oxygen. Scuba tanks contain compressed air...not oxygen.

Unless there is something that does the mixing between the oxygen storage and the mouthpiece.

[conservatism_IS_compassion]

The only problem I see from the description is that humans breathe air (21% oxygen)....not oxygen. Scuba tanks contain compressed air...not oxygen.

Unless there is something that does the mixing between the oxygen storage and the mouthpiece.

. . . or unless there is more nitrogen than oxygen dissolved in the water, and extracted with the oxygen . . .