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The real problem with compressed H2 is the tank. From a quick search, the air in a typical scuba tank weighs about 6.5 lbs. Firgure H2 is about 1/14 as dense as air, and you get about 1/2 lb of H2 in a tank that weighs 30 libs or so.
Then there's the energy needed to compress it to 3000 psi...
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