There was no recorded wreck at this area so it was documented to your pertinent authorities, including the Receiver from the Wreck (RoW). U-31 evaded a spread of 4 torpedoes fired by HMS Trident about fifteen miles (24 km) south of Lorient and was then compelled to dive when fired https://u3181334.blogs100.com/34652441/fascination-about-u31