> Few are ready to live under 24 hour nuclear watch, but it’s possible that’s what many cities have been under and can never be told.

Effectively every city on the planet is perpetually on 24 hour nuclear watch and has been for decades now. This is completely "known" to anyone who cares to know and has taken the time to understand modern nuclear doctrine.

You should read The Doomsday Machine! It'll help amp up your anxiety ;)