The only way to tap energy out of water is, and this is for now purely theoretical, if you can split it into hydrogen and oxygene, isolate the heavier isotopes of hydrogen and then start a fusion process. There are working fusion reactors, but it is unlikely that you can fit one on a sub for any time soon. not to mention one that produces enough energy to split the water molecules, isolate the heavier isotopes and still propel the sub.
Ceramic hull sounds interesting though. :hmm:
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