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Electrolysis of sea water already takes place inside a submarine...............how else will they generate Oxygen for the sailors????

Firstly, Stirling engines are already passe wrt submarines. AIP is currently the reigning alternative. However with rapid changes in the energy densities & costs of the batteries, AIP (chemical based) will be gone in next generation. In the next 5 years itself they're talking about 500 KWhr...