There was no recorded wreck at this locale so it was documented into the applicable authorities, including the Receiver of the Wreck (RoW). U-31 evaded a unfold of 4 torpedoes fired by HMS Trident about fifteen miles (24 km) south of Lorient and was then pressured to dive when fired https://titusvtsmd.aioblogs.com/87155068/u31-an-overview