There was no recorded wreck at this place so it had been described for the relevant authorities, such as the Receiver of the Wreck (RoW). U-31 evaded a spread of four torpedoes fired by HMS Trident about 15 miles (24 km) south of Lorient and was then pressured to dive https://u3133084.blogoxo.com/32434145/u31-fundamentals-explained