Completed in October 1911 as British Glensloy for SS Glensloy Co Ltd (Easton, Greig & Co), Glasgow. 1932 sold to Latvia and renamed Curonia for Quayside Shipping Co Ltd (Janis Salcmans & Karlis Jansons), Riga. 1939 renamed Everagra for Fricis Grauds, Riga. When Latvia was annexed by the Soviet Union in 1940, she was one of eight ships that did not follow the orders to return home and continued to sail under the Latvian flag. U-boats sank five of these eight ships and damaged a sixth while another one was sunk by an Italian submarine. On 15 May 1942, the Norwegian motor tanker Havprins transferred 18 survivors of the Esso Houston that had been sunk by U-162 (Wattenberg) two days earlier, to the Everagra, which landed them at St. Thomas, Virgin Islands on 18 May.

Post-war:
1952 registered in Panama as San Antonio for John Manners & Co Ltd, Hong Kong. On 6 Jan 1957, wrecked in hurricane on Mathieu Reef, New Caledonia and broke up in heavy seas.

At 05.20 hours on 8 July 1943, U-510 fired three torpedoes in one minute intervals at convoy TJ-1 and reported hits on three ships. At 07.19 hours, the U-boat fired five more torpedoes and claimed hits on two further ships. At 13.07 hours, U-510 attacked convoy again and reported another ship of 6000 tons sunk. However, Allied sources only confirm hits on three ships: B.P. Newton, Eldena and Everagra, which was only damaged. It seems that the U-boat attacked the same targets several times.

The Everagra (Master Sergey Bol) was hit by one torpedo about 150 miles northeast of Cayenne, French Guiana. She managed to reach a port, was repaired and returned to service.