In November 1983, Soviet nuclear forces went on high alert when intelligence reported alarming activity on US bases. In response, the Soviets planned for a nuclear strike by NATO on Eastern Europe. And then Able Archer 83, a vast NATO war game exercise, ended. What the West didn't know was that the Soviets thought Operation Able Archer 83 was real and were preparing for a surprise missile attack from NATO. This close scrape with Armageddon was unknown until 2015, when the US released an analysis. Able Archer 83 vividly recreates the atmosphere that nearly unleashed nuclear war.