Operation Dervish sailed from Britain in August 1941, the first of the Arctic convoys that would carry fuel, raw materials, food, and military equipment from the United Kingdom, Iceland, and North America to a Soviet Union reeling from Operation Barbarossa. This film tracks why Churchill committed ships and crews to one of the most dangerous supply routes of the Second World War, sailing past occupied Norway and through waters patrolled by U-boats, surface raiders, and the Luftwaffe, with Arctic ice and weather as a constant additional enemy. Archival footage and expert commentary lay out the strategic logic Churchill and his commanders weighed: keeping Germany fighting on two fronts meant keeping Stalin supplied, whatever the cost in ships and sailors. The film follows the convoy system from Dervish through the campaign's worst losses, treating the route as both a lifeline for the Soviet war effort and one of the costliest theaters the Allies fought in. It is a straightforward, footage-driven account of a less-told corner of the war at sea.