Image used for illustrative purpose.
A general view shows a structure over the old sarcophagus covering the damaged fourth reactor at the Chernobyl nuclear power plant, in Chernobyl, Ukraine April 20, 2018.
Employees walk through the corridor of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
Dogs are seen in front of a new Safe Confinement (NSC) structure over the old sarcophagus covering the damaged fourth reactor at the Chernobyl nuclear power plant, in Chernobyl, Ukraine April 20, 2018.
A telephone is seen in a control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
Journalists walk through the corridor of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A control panel is seen in a control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A control panel is seen in a control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
Workers sweep radioactive dust at a nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A water tanker sprays water on a road to prevent radioactive dust from being blown away in front of the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A general view shows a New Safe Confinement (NSC) structure over the old sarcophagus covering the damaged fourth reactor at the Chernobyl nuclear power plant, in Chernobyl, Ukraine April 20, 2018.
An employee walks through the corridor of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018. REUTERS/Gleb Garanich
An employee and journalists walk through the corridor of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
An employee walks at the control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A control panel is seen in a control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
An employee walks through the corridor of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
A visitor holds a butterfly that was found in a pump room of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
An employee measures the radiation level as journalists take pictures at a control centre of the stopped third reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine April 20, 2018.
Inside Chernobyl
Scenes inside the Ukrainian power plant more than 30 years after a nuclear disaster permanently poisoned swathes of eastern Europe.