You know, they say that necessity is the mother of invention. How about this...
Take regular scuba (self contained underwater breathing apparatus) gear and add a battery. Run the DC (direct current) through the water in an enclosed chamber. Collect the gas from one of the electrodes, which will be oxygen gas. Let the gas from the other electrode bubble to the surface, because it's hydrogen gas and flammable... and explosive. Then the scuba gear and re-incorporate that extracted oxygen from the water into the scuba tank to renew the amount of oxygen available. That should let anyone who wants to stay down as long as they can. Or get Nitrogen poisoning from being down too long.
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