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What nuclear crisis threatens the United States in Sidney Lumet’s Fail Safe?

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In the 1964 film Fail Safe, directed by Sidney Lumet, the nuclear crisis is triggered by an accidental order sent to a squadron of United States bombers to attack Moscow during the Cold War. The crisis centers on the military's inability to recall these nuclear-armed aircraft.1

To prevent an all-out nuclear war after one bomber successfully reaches its target, the U.S. president, played by Henry Fonda, makes the harrowing decision to order a retaliatory nuclear strike on New York City to prove to the Soviet Union that the initial attack was a tragic mistake rather than an act of aggression.1