The super rich buying these underground appartments will go mad in weeks.
Not only that, they'd probably end up killing one another.
Id rather be incinerated.
Being an occasional 'Tunneler', I know quite a few places in the North West where I could hole up.
As I said on another recent thread, stockpile the homebrew kits and several tonnes of sugar.
Then emerge about 5 or so years later looking a bit like Gollum.
As a kid I lived near one of the decommissioned ROTOR stations that provided a great adventure playground for us. Latterly I found out that the site was at one point was going to be one of the silo locations for Britains short lived Blue Steel nuclear missile programmes. All a few miles from my house, I guess we would not have felt anything in the event of a soviet attack!