Meanwhile, in the control room, deep in Chernobyl's No. 4 Reactor, the deeply unpleasant and tyrannical Chief Engineer Anatoliy Dyatlov and his anxious subordinate, Aleksandr Akimov are arguing whether or not to finally press the AZ-5 button.

The AZ-5 button would [insert 10,000 words on thermo-nuclear physics] and so, of course, the rest of the USSR is relying on the correct decision being made, or millions of people will die.

They both know they won't survive the night, and only have 60 seconds to make their decision - "There's only one thing for it" proclaimed Dyatlov, "this calls for a game of krestiki-noliki".