There was no recorded wreck at this locale so it was noted on the relevant authorities, including the Receiver from the Wreck (RoW). U-31 evaded a distribute of 4 torpedoes fired by HMS Trident about fifteen miles (24 km) south of Lorient and was then compelled to dive when fired https://u3110885.theideasblog.com/34644926/everything-about-u31