On 15 May 1942, the Norwegian motor tanker Havprins transferred 18 survivors from the Esso Houston, which was sunk by U-162 (Wattenberg) two days earlier, to the Everagra, which landed them at St.Thomas, Virgin Islands on 18 May. 

At 05.20 hours on 8 Jul, 1943, U-510 fired three torpedoes in a one minute intervall at the convoy TJ-1 about 150 miles northeast of Cayenne, French Guiana and reported hits on a tanker of 10000 grt, another of 6000 grt and a third of 5000 grt. At 07.19 hours, U-510 attacked again in grid EP 4925, fired five torpedoes and reported that two ships of 10000 grt and 6000 grt had been hit. At 13.07 hours, U-510 attacked the convoy a last time and reported a ship of 6000 grt was sunk. The Allied side reports that three ships were hit in the first attack, B.P. Newton, Eldena and Everagra of which the last was only damaged. It seems that U-510 attacked the same targets several times.