I was a contractor in the '80s and I built a bunker for a client outside Atlanta.
He was convinced that everything was going tits up shortly, either from economic collapse or Soviet desperation.
He had flown off carriers during the Vietnam war and had gone through nuclear training. His training had basically taught him that in at least a limited nuclear exchange, most of the stuff simply wouldn't go off. Nucs, at least then, were delicate things that were expected to often be shaken enough in the boost phase that many simply wouldn't work.
It was a really fun exercise, to be honest. Studying how much concrete boils off from a particular size explosion, etc.
This thing had decontamination showers, weapon lockers, a buried well head, steel shuttered loop holes for firing at mutants, a secret passage leading to a door hidden behind a bookcase, the works.
Since he could pay for it from petty cash, it was no problem financially, just like the elite today.
Admit it, everyone here would do the same if they could. If for no other reason than the systems design exercise.
Better keep it secret!