At 1022 hours, a pair of torpedoes 450mm, W 200 type) were fired at a range of about 3,000 metres, one hit after 140 seconds and the target was brought to a stop. This was the Norwegian Fernlane (4,310 GRT, built 1927).

At 1050 hours, a single torpedo (450mm, A 115 type) was fired and caused further damage. The target was still afloat but now abandoned.

At 1115 hours, a fourth torpedo (450mm, type A 115) was fired which hit the Norwegian ship and she finally sank at 1125 hours. There were no casualties. The thirty-five survivors (thirty-two crew members and three passengers) reached Caravela Island in the Bissagos Archipelago by their own means.