The record
The defining act
On September 26, 1983, a Soviet early-warning system reported five incoming American missiles. Petrov classified the warning as false rather than pass it upward as a confirmed attack, reasoning that a real first strike was unlikely to consist of only five missiles.
What was at stake
The alert arrived during a period of severe Cold War tension, only weeks after the Soviet Union shot down Korean Air Lines Flight 007. Soviet leaders would have had minutes to interpret any warning and decide whether to respond.
What followed
The satellites had mistaken sunlight reflected from clouds for missile launches. Petrov was reprimanded over his documentation, and the incident remained secret until after the Soviet Union collapsed.
Why Pax Terra remembers them
He protected the future by refusing to let machinery outrank human doubt.