Every convoy that sailed from Iceland to the Soviet Union in World War II ran a gauntlet of two enemies at once: the Kriegsmarine and the Arctic itself. This film follows the ships carrying tanks, planes, ammunition, and food across a Nazi-patrolled ocean where storms, months of near-total darkness, and ice thick enough to disable a hull were as lethal as any U-boat. It sets the convoys against the wider war, explaining why, in the spring of 1942, with the Wehrmacht stalled outside Moscow and preparing its push toward Stalingrad, cutting this supply line became a German priority worth committing waves of Luftwaffe bombers to the effort. Archival footage and expert narration lay out how crews navigated frozen rigging, sub-zero exposure, and near-permanent night alongside torpedo attacks and aerial bombardment. The film treats the weather as a genuine tactical factor rather than a backdrop, showing how climate shaped convoy routes, timing, and casualty counts as much as German firepower did.