There was no recorded wreck at this site so it was documented to your relevant authorities, such as the Receiver with the Wreck (RoW). They were considered superb boats. Over the war 8 were being sunk, a few surrendered and ended up inevitably scrapped, and two were being thought of https://u3192209.p2blogs.com/33053001/the-smart-trick-of-u31-that-no-one-is-discussing