Between 1941 and 1945, Allied merchant ships made 78 convoy voyages across the Arctic Ocean to deliver vital war supplies to the Soviet Union via the ports of Murmansk and Archangelsk. These were among the most dangerous naval operations of the war. The convoys faced extreme cold, constant darkness in winter, savage storms, and relentless attacks from German U-boats, surface ships, and aircraft based in occupied Norway. Over 3,000 Allied seamen lost their lives on this route. The convoys delivered approximately four million tonnes of supplies, including tanks, aircraft, ammunition, and food that were crucial to the Soviet war effort, particularly during the critical years of 1941-1943. Winston Churchill called it "the worst journey in the world." Many of the merchant seamen who sailed these routes lived in the UK, and their sacrifice is commemorated each year by veterans' organisations across Britain.