I think I'll take my chances above ground.As far as coronavirus is concerned it only takes one person in the condo's to bring it in.As for nuclear attacks,do you stay underground for generations until we evolve into Morlocks lol.Only winners in this one are the developers.
A couple nights ago on C2C, Ian Punnett interviewed an author who's written a book about bunkers and preppers. He tended to focus on bunker communities, usually catering to the ultra rich due to costs involved. Ian made a great point, noting few, if any, of those buying their way into such a community would have practical skills valuable in the day-to-day running of facilities. As he said, "Imagine 'Gilligan's Island' with seven Mr Howells."