As Russia and the West warn of a new Cold War after the Georgian conflict, the BBC’s Humphrey Hawksley in Moscow tries to imagine what it would look like.
Evgenia Evlenteva strode past a row of old radiation suits hanging on pegs like raincoats.
With a bounce in her step and a torch stuck into her jeans back pocket, she asked: “Right, it’s more than 60 metres (200ft) deep so do you want to take the stairs or the lift?
“Oh and by the way, the door weighs three tonnes. It’s made of lead and metal, and it still works.”
She jabbed a button and, with a groan and a creak, a huge slab slid back and let us into one of Moscow’s key Cold War nuclear bunkers.
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To see how war might unfold The Third World War