There was no recorded wreck at this area so it was documented to the relevant authorities, including the Receiver with the Wreck (RoW). U-31 evaded a spread of 4 torpedoes fired by HMS Trident about 15 miles (24 km) south of Lorient and was then pressured to dive when fired https://u3189764.idblogz.com/32820973/getting-my-u31-to-work