Theo Wilson time-travels to Russia on April 26th, 1986, as workers at the Chernobyl nuclear plant are in the throes of a disaster that will put the lives of millions of Soviet citizens and Europeans in jeopardy. The name Chernobyl still evokes dread, but the big question is, how did it happen? Theo Wilson goes back in time to uncover the truth - discovering how the 1950s cover-up of another nuclear disaster, engineers turning a blind eye to fatal design flaws of Chernobyl's RBMK reactor, a Soviet holiday, the night shift and a breach in protocol lead to the world's worst nuclear meltdown.