[Spaceships] Total life support

[Crakkerjakk]

I've always assumed that the whole "open space providing total life support" thing didn't leave it as an open space with rolling fields of wheat, but converted it into an extensive life support system, with algae, aquaculture, tilapia tanks, fauxflesh vats, etc occupying the entire space.

I suppose that's not really supported by the text, but I don't see how it could provide the life support any other way.