Re: [Spaceships] Total life support
I might add that there's no reason for total life support to be common unless you're in a no-FTL setting. Even as described it's complicated and involves all sorts of fussy components and a boatload of different skills to keep it working.
Compare to real life SSBNs - they spend months in what might as well be hard vacuum (except for a bit of water desalinisation), without contacting any source of re-supply and yet no-one has yet shown any interest in producing food aboard one.
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