Exactly to the 1:23:58 AM, in the night of Friday 26 April, 1986, happened the worst nuclear disaster of all 20th Century: Chernobyl. Journalist Iker Jiménez, host and creator of the Spanish supernatural TV program "Cuarto Milenio" (Fouth Millennium), makes a special documentary to analyze and investigate the infamous explosion of the reactor No. 4 of the nuclear power plant of Chernobyl, former USSR (actual Ukraine), when a failure of the engine of the system caused a radioactive cloud that quickly crossed all Europe Central, arriving Asia and America, giving three complete laps around the world