https://www.npr.org/templates/story/story.php?storyId=113242...
> If there's a crisis, somebody in the Defense Ministries has to turn it on, so that's the first step. It then tries to find evidence that there's been a nuclear hit on the Soviet Union. If it determines that there has been a hit, then it tries to communicate back to the Defense Ministries. And if it can talk to them, it says, okay, humans are still alive. I don't need to work. I'll shut off.
> But if it can't communicate with them, then it knows there's been a crisis. We've been hit by a nuclear warhead and all the lines of communications with the Defense Ministries have been taken out. So now, we need to bypass all the traditional layers of command authority, and suddenly, the ability to launch a nuclear retaliatory strike is given to some junior official in a bunker.