Re: Minimum TL for a self-sufficient Vault City or equivalent bunker?
An RTG would be a good power source for a Vault. No moving parts, so they last an awful long time without maintenance - and that's probably going to be the crucial thing here, along with life support.
If you had a big enough vault with enough spare parts and people in it you could probably do it at TL6, sure, maybe even lower if you found a suitable enough plant that grows underground without sunlight. The hard part is making it not the size of a city and having it last a significant amount of time.
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