There was no recorded wreck at this area so it absolutely was documented into the pertinent authorities, such as the Receiver in the Wreck (RoW). They were regarded excellent boats. Through the war 8 were sunk, a few surrendered and have been ultimately scrapped, and two ended up considered lacking. https://u3107642.bloggerchest.com/34063915/the-smart-trick-of-u31-that-nobody-is-discussing