In the early hours of April 26, 1986, Leonid Toptunov, a young, inexperienced and tired member of the night crew at the Chernobyl nuclear power station, near Kiev, allowed the level of reactivity.

Leonid Toptunov Chernobyl
The Chernobyl Nuclear Power Plant disaster of April 26, 1986, is one such moment. At the heart of this catastrophic event were two young engineers, Leonid Toptunov and Aleksandr Akimov,.