Which, to me, seems like the closest real-world-on-Earth-world training simulation you could develop. You’d be totally reliant on one power source, sealed insi

Which, to me, seems like the closest real-world-on-Earth-world training simulation you could develop. You’d be totally reliant on one power source, sealed inside a pressurized tube, with totally disrupted circadian rhythms. But at least on a nuclear sub, you have the chance to escape to the the surface world, and a chance to restock there. On Mars? Step outside, you’re dead, and if you can’t replicate a resource on a world with less gravity & less solar power & not a shred of a biosphere, you’re dead. Sounds like a fun, low-stress environment to me. Humans do great with living with unrelenting psychological stress in sealed metal tubes.