The map resurfaced as nuclear fears grew after the Chernobyl power plant in Ukraine was hit by a Russian drone. The plant was the scene of the world's worst ever nuclear meltdown in 1986.

Sixty-two-year-old Sergii Mirnyi will never forget the year 1986, when he was sent to help deal with the nuclear disaster in Chernobyl that was threatening to poison the continent. Mirnyi was a ...