Liquidation of the consequences of the Chernobyl nuclear power plant accident

USSR. Ukrainian SSR. Kiev region. A Mi-26 helicopter during aerial decontamination of the area in the thirty-kilometer exclusion zone near the V. I. Lenin Chernobyl Nuclear Power Plant after the accident. On April 26, 1986, an explosion occurred at the fourth power unit of the NPP during equipment testing during a reactor shutdown for routine preventive maintenance. Valery Zufarov/TASS