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  As has been said before, the future of diving may well be the mixture
rebreather with a microchip (or other automatic controller) that automatically
detects the pressure and the partial pressure of oxygen and adjusts the gas
flows accordingly. But from what I have heard this has run into difficulties
because gas flow valves need a fair amount of strength to operate them, so
adjusting the gas flow needs such a big amount of electricity power to keep
turning the gas valves against their mechanical stiffness, that the breathing
set has to contain a very big expensive lithium battery or fuel cell or the
like, and difficulties occur in handling that much raw power in a breathing
set continually immersed and likely to get into any attitude.
  (1) Is the above correct?, or did I misunderstand something?
  (2) It seems that what is needed is gas flow valves that need far less power
to operate them, so that the breathing set can run on less electricity and
ordinary batteries. When will such gas flow valves be designed?

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