There was no recorded wreck at this location so it was reported to your relevant authorities, such as the Receiver from the Wreck (RoW). They ended up regarded fantastic boats. Over the war eight had been sunk, three surrendered and ended up finally scrapped, and two were being regarded missing. https://u3146268.tribunablog.com/the-smart-trick-of-u31-that-nobody-is-discussing-46692377