During the war U-7 sank two vessels: * The British 2,694 ton Akenside, on September 22, 1939 * The Norwegian 1,830 ton Takstaas, on September 29, 1939 On February 18, 1944, west of Pillau, U-7 sank in what is believed to have been a malfunction during a diving maneuver. There were no survivors.