I have never been diving but I do remember taking one end of a open garden hose and jumping into a swimming pool thinking I was going to sit at the bottom and breathe through the hose. Of course it didnt work as the pressure of the water at 9' was too great for me to inhale a breath of air. When diving I know the compressed air tank has a regulator and the air is fed to the diver at a certain pressure so must you vary this pressure when diving at deeper depths? Do you need "X" amount of pressure to be able to take a breath at "X" depth? Thats off the subject here but was just curious.
If someone was to come up with a more energy efficient way of electrolysis is it possible that a miniature version of a oxygen generator on a sub could be used for diving? Of course you would need another supply of gas such as nitrogen to mix with the oxygen to make breathable air but I suppose that would be possible eh? I know at present time it takes a low voltage high current source for electrolysis but is it possible he is incorporating something simular to this in his design? Sounds more feasable than just pulling dissolved oxygen from water to create breathable air so maybe electrolysis to help create oxygen and a centrifuge to create low pressure and pull available gases from the water as well? Or maybe I have too little oxygen to my brain and im crazy!