Documentary-feature story about one instructive incident, which happened in 1983, it would be useful to hear then, the General public knows little about the true hero, thanks to the courageous actions of which human civilization still exists. His name is Lieutenant Colonel Stanislav Petrov. Us President Reagan declared the USSR an evil Empire for the whole world, the confrontation between the two superpowers reached its apogee. On night duty in the command post "Serpukhov 15" instead of the sick co-worker leaves Petrov, where is located the mine of the enemy, he knows, Vince is preparing for another quiet night. Suddenly, the satellites record unauthorized movement, and the command post is heard a deafening alarm – from one of the American bases in the direction of the USSR launched an Intercontinental strategic nuclear missile. According to the Charter, the duty officer is obliged to report to the command and in response to the received order, press the "start"button! But something stopped the Lieutenant Colonel, so who is he – a hero or a violator of the oath? Later investigation will show that the optics of military satellites has malfunctioned, taking sun glare for the flash. Such films should be watched, especially by young people. Silencing the heroic actions of their fellow citizens is like a crime. All the more surprising that the film was shot not in Russia but in Denmark.