HISTORY’S GREATEST MYSTERIES

9PM, SKY HISTORY ★★★

In 1971, a man known as D.B. Cooper hijacked a plane over the US and jumped to a fate unknown, along with a $200,000 ransom. Eric Ulis (left), who has spent 7,500 hours of his life on the investigation – including poring through 20,000 pages of FBI files – gives us the condensed version of his findings.