At 05.25 hours on 21 May, 1941, the unarmed and neutral Robin Moor (Master Edward W. Myers) was stopped by blinker light by U-69 about 700 miles off the west coast of Africa. After questioning the chief mate that came aboard the U-boat, Metzler told him that he has to sink the ship according to the prize rules and ordered the crew to leave their ship in 30 minutes. The nine officers, 29 crewmen and eight passengers (four men, three women and one child) abandoned ship in four lifeboats. At 09.49 hours, the U-boat fired a stern torpedo that hit in the port side and sank her with 30 rounds from the deck gun. The survivors were provided with rations before the Germans left the area.

The boats stayed together for three days, but one of them became separated. The survivors in three boats were picked up on 2 June by a British merchant and landed at Capetown. The ten crew members and one passenger in the fourth boat were picked up on 8 June by the Ozório in 00°16N/37°37W and landed at Recife, Brazil.