Google Translate Lieutenant Colonel Stanislav Petrov was duty officer on the Serpukhov -15-Bunker (about 50 miles south of Moscow). His task was the computer-and satellite-based monitoring of air space. In the event of a nuclear attack on the USSR saw the strategy before one all-out immediate nuclear retaliation. Shortly after midnight of the 26th September 1983 announced the approaching one computer to the Soviet Union, U.S. nuclear missile. Petrov concluded with the unlikelihood of a single missile first strike carried out because of massive retaliation would mean the total annihilation of the aggressor. In addition, the reliability of the satellite system (was Cosmos 1382 has previously been found several times in question. Petrov classified the incident as a false alarm. A short time later reported the computer system a second, third, fourth and fifth rocket fired. Petrov continued to believe in a false alarm, but had no other sources to verify his suspicions. The range of Soviet land-based radar was so short that it would be the time of discovery was too late. Standing under such tremendous pressure, Petrov remained in deciding the information that led to a counter-attack, not forward. He sat still on a computer error, knowing that in the event of an error on his part, immediately dozens of nuclear warheads would fall on his home country. Since the satellite system but reported only five missiles fired, he walked out of a false alarm. An actual attack would have taken place in his view, with many more weapons. Shortly after this morning turned out that Petrov's estimates were correct - the Soviet satellite early warning system had sun reflections on clouds in the vicinity of Malmstrom Air Force Base in Montana, where American intercontinental missiles were stationed, misinterpreted as a missile launch. Even if the order to counterattack would ultimately still the Soviet high command and the need to rearrange governance, Petrov had stopped in time by his prudent conduct the hierarchical chain reaction to a possible nuclear war.