There was no recorded wreck at this locale so it was documented to your applicable authorities, including the Receiver in 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://milolssph.blogofchange.com/34738239/details-fiction-and-u31