 Later in the war, the boat laid mines in the Bay of Biscay, claiming three German auxiliary minesweepers, an armed trawler, and a Vichy French tugboat in 1942, and a fourth auxiliary minesweeper in 1943.Operating off Stavanger in September 1944, the boat's mines claimed two auxiliary submarine chasers and two merchant ships.In October and November, "Rubis" continued in Norwegian waters, damaging but not sinking two vessels.