 Lüth's last patrol with the boat began on 30 December 1941, when "U-43" sailed from Lorient into the mid-Atlantic, where she sank three more ships.The first was the 5,246 ton Swedish cargo ship "Yngaren", straggling from convoy HX 168 due to bad weather, about west of Ireland.On the morning of 12 January 1942 the ship was hit by two torpedoes and sank within a minute.