[cukfvjlv] Nuclear submarines are fish

Assuming nuclear submarines generate electricity then extract oxygen from seawater by electrolysis, it is quite a milestone human achievement: we have created a way for humans to never have to surface for air, at least until food or nuclear fuel runs out.  In principle, food and nuclear fuel could both be acquired underwater.

We finally became on par with fish.  In contrast, conventionally powered submarines presumably have to surface occasionally, so are like marine mammals.