During World War Two, Britain was absolutely reliant on maritime trade for its survival. The protection of its merchant fleet, therefore became an issue of paramount importance. After June 1940 however, German U-Boats began to operate in the Atlantic and appalling losses were inflicted on Allied merchant shipping. Arctic convoys were twice suspended in 1942 as German aircraft and submarines wrought havoc on the waves. The trip to the Russian port of Murmansk soon became known as the 'death trip' because so few ships returned. Featuring powerful filmed memories of veterans from both sides of the conflict, this is an account of one of World War Two's most pitiless theatres of operations, where men lived in constant fear of the unseen dangers of the deep. This video features 3-D graphics and animation to show the realities of a submarine attack and the mechanics of a ship's defences, with in-depth analysis from Dr. Tim Bean of the Royal Military Academy, Sandhurst.