There was no recorded wreck at this locale so it was described to your pertinent authorities, including the Receiver with the Wreck (RoW). They were regarded fantastic boats. Throughout the war 8 ended up sunk, 3 surrendered and were at some point scrapped, and two have been considered lacking. Now https://edwinjlexf.thekatyblog.com/31218175/rumored-buzz-on-u31