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07183492 �SERGEY DOLZHENKO/EPA/MAXPPP - CHERNOBYL 20181122 Visitors look on the new protective shelter over the remains of the nuclear reactor Unit 4 at the Chernobyl nuclear power plant, in Chernobyl, Ukraine, 22 November 2018. The explosion of Unit 4 of the Chernobyl nuclear power plant in the early hours of 26 April 1986 is still regarded as the biggest accident in the history of nuclear power generatio