On 22 Feb 1944, U-510 made two attacks at convoy PA-69 about 200 miles from Aden and reported two tankers and one freighter sunk, one freighter was left burning and sinking and one other freighter was damaged by one torpedo. Three tankers were hit, the San Alvaro, E.G. Seubert and Erling Brøvig. The last stayed afloat with a broken back and both parts were towed to port. It is not clear whether one ship was hit by two torpedoes.

The E.G. Seubert (Master Ivar Boklund) in station #21 was hit by one torpedo on the port side in the #10 tank and the cross bunkers. The explosion blew one of the after machine guns over the side and started a small fire. The steam smothering line quickly put out the flames. The engines were stopped, as the tanker settled rapidly with a list to port. Only one lifeboat could be launched before the ship suddenly capsized to port and sank by the stern, twelve minutes after the hit. The most of her crew of eight officers, 35 men and 27 armed guards (the ship was armed with one 4in, one 3in and eight 20mm guns) abandoned ship by jumping overboard and had to swim through fuel oil several inches thick. One officer, two men and three armed guards, including the commanding officer died. The survivors were picked up by HMAS Tamworth (J 181) and HMIS Orissa (J 200) and taken to Aden, arriving on 24 February.