Formerly secret KGB files reveal the truth about the 1986 explosion of the Chernobyl nuclear reactor in war-torn Ukraine. At 1:23am on 26 April 1986, Reactor 4 of the Chernobyl Nuclear Power Plant exploded, releasing clouds of deadly radioactive fallout. The poisonous atomic cloud spread over Europe, causing at least 5,000 cases of cancer. Chernobyl: The New Evidence reveals a story of cover-ups ahead of the explosion and, afterwards, bravery that saved the world from an even deadlier disaster. The documents reveal just how much the KGB knew about issues at the Chernobyl plant in the run-up to the disaster, due to a number of undercover agents and informers working at the reactor site. Featuring leading experts alongside eyewitness accounts, from a KGB general, a reactor worker, firemen and a young mother whose unborn child’s life was put at stake, this series reveals a story that has stayed hidden for years and lays bare the terrible human consequences of the world’s worst nuclear disaster.