So as you probably all know, the Fallout series has these fallout shelters called “Vaults” that were used to conduct morally questionable experiments on their inhabitants. Well, I am writing a post apocalyptic story myself, and in that universe there is a program similar to the Project Safehouse program in Fallout.
It doesn’t have any nasty experiments behind it, and all shelters are designed to legitimately help the inhabitants rebuild society. There were 50 shelters scattered across the country, each with a population of 5,000, from Los Angeles east to New York, and Detroit down to New Orleans. So my question is what would be the most effective way to build and run the shelters inorder to fit the criteria listed below?
The population has to be totally protected from the blast and radiation until it is safe for them to leave. NO EXCEPTIONS!
Once the leave, they have to be totally or at least semi-self sufficient, meaning they should be able to grow their own food, get collect their own water, build their own towns and settlements, and defend their possessions.
The settlement they build should also be Modern of semi-modern, meaning at bare minimum they should have running water and electricity.
You need to be able to survive in the shelter for a maximum of 40 years without any help topside.
The Settlement has to be finished in under 500 years, which I think is more than enough time.