The clock isn't updated instantly. The closest nuclear war threat, the Cuban Missile Crisis in 1962, reached crisis, climax, and resolution before the Clock co

The clock isn't updated instantly. The closest nuclear war threat, the Cuban Missile Crisis in 1962, reached crisis, climax, and resolution before the Clock could be set to reflect that possible doomsday. https://en.wikipedia.org/wiki/Doomsday_Clock#Symbolic_timepiece_changes https://en.wikipedia.org/wiki/Doomsday_Clock#Symbolic_timepi...