I knew a dentist who thought that way, so he bought PVC pipe and dessicant bags and gathered M1s, M1 Carbines, AR15s, Springfields and a whole host of parts, web gear, survival supplies and ammunition.
He owned a couple of farms and acreages and an auger - so he and his nephew would go out and dig holes (probably by the light of the moon) - and 'somewhere', he recorded locations.
Then - he died of a heart attack - and a couple of weeks later - the nephew died in a car wreck.
It's still out there - somewhere...