This is how you would do it in relative safety and luxury.
Well, only a few wealthy people survive. I wonder how the pampered wealthy will make out ruling what is left of the USA? You can’t live underground forever.
Nice class warfare rhetoric, Bitsy. :-P
The idea is not to live underground indefinitely. The idea is to shelter in place with your family, if required.
Let’s say there is general social unrest due to a large-scale viral outbreak. (One possible scenario in which you might need to shelter in place.) You can put plastic up on the walls of your house and hope no infected people break in to steal your stuff - and possibly infect you - or you can have a nice underground bunker to retreat to until the situation stabilizes.
If I had the cash, I might take the one with the in-ground pool. ;-)