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North Korea ramps up preparations for war with US (www.newsweek.com)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 4 points 10 months ago (1 children)

I don't know if this is done in practice, but if you have a nuclear powered sub, implementing a water electrolyzer that makes oxygen is fairly trivial. Then you have air as long as you have power, so they could in principle stay submerged for ≈ 20 years, or however long the nuclear reactors can go without refill.

[–] [email protected] 2 points 10 months ago

Technically a Sub can stay underwater forever, it is the crew that is the problem there. If they had Star Trek replicators to make them food with that reactor then boredom becomes the limiting factor.