True story. In October 1962, Russian submarine officer Vasili Arkhipov refused to sign off on his commander's plan to nuke the U.S. fleet surrounding Cuba during the missile crisis. Such an attack would likely have resulted in a worldwide nuclear weapons exchange; Herman Khan's "Thinking About The Unthinkable" played out in real life and in real-time. Historian Arthur Schlesinger Jr. , an advisor to President John F. Kennedy, called this the most dangerous moment in human history.