On 26 September 1983, Stanislav Petrov, an engineer of the Soviet Air Defence Forces, prevented an all out nuclear war.

“First, it was just one missile, but then another, and another, until the system reported that a total of five Minuteman ICBMs had been launched.”

(Article from 2018) https://www.vox.com/2018/9/26/17905796/nuclear-war-1983-stanislav-petrov-soviet-union

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