Sky History 2 Saturday

Events of 1941, when Hitler invaded the USSR. Plus, Operation Barbarossa stalled as winter hits and Soviet resistance - fuelled by propaganda - turned the tide

Eye-witness accounts and archival footage describe the German U-boat push into British waters, featuring stories of bravery and new technologies employed in the conflict

Stories of espionage at sea, including deadly U-boat cat-and-mouse games, the sinking of the Lusitania, a gun-smuggling private yacht and liners-turned-troopships

An insight into the crimes of Myra Hindley and Ian Brady, establishing the chronology of their acts and explaining why it took so long for the pair to be brought to justice

How Isis sold antiquities to fund its terrorist actions aganst the West, with collectors turning a blind eye to the source of the items they were buying

Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers