Well mine isn't, even if hypothetically I could afford such a structure, or have somewhere to put it. I mean what's the point? why would anyone want to emerge into, a world that's decimated, it kind of smacks of being cryogenically frozen or whatever Walt Disney had done to himself. Utterly futile and preposterous are my thoughts, better to go in the big bang.
It was with amusement that I skim read an article a while ago as to where Mark Zuckerberg's is sited and then that expanded on the non perishable food that would be needed, not forgetting pet food etc. etc. So if some megalomaniac does his worst, I say he because most of them seem to be identifying as male as far as we know. No doubt they will be safely tucked up in their all mod cons bunker, along with various billionaire technocrats, dodgy mafia, oligarchs, tax evaders, those who form that dubious body known as the WEF and at some stage, as their food supplies dwindle they will have to emerge into a barren waste land, where nothing is likely to grow, or even have a water supply. The world's little people will have been blown to kingdom come, which is a downside if you are such a person who wishes to have a disposable bevy of malleable but expendable prolls at your service. Oh well at least they'll have each other!
So would you fancy your chances in a nuclear bunker or opt for oblivion ?