Twenty years after the Chernobyl tragedy, Piero Angela and a crew from Superquark have produced a special dedicated to those places that are still isolated for a radius of 30 km. The nuclear reactor, which exploded on the night of April 26, 1986, is not yet turned off: the melted fuel is still incandescent. The emergency cover has cracks, and there are fears of a collapse if nothing is done soon. The Superquark crew went to the sites of the disaster: to the nuclear power plant and to the ghost town of Prypiat, hastily abandoned by its inhabitants and left as it was at the time. An English fiction will reconstruct with actors what happened that night in the control room, and all the lies that followed in the following 36 hours. With Paco Lanciano and with the help of models Piero Angela will explain why the reactor exploded.