There was no recorded wreck at this locale so it was documented into the pertinent authorities, including the Receiver in the Wreck (RoW). U-31 evaded a spread of four torpedoes fired by HMS Trident about 15 miles (24 km) south of Lorient and was then pressured to dive when fired https://u3181108.targetblogs.com/34612695/u31-an-overview