There was no recorded wreck at this place so it had been described into the appropriate authorities, including the Receiver on the Wreck (RoW). They were regarded excellent boats. Over the war eight have been sunk, a few surrendered and were being finally scrapped, and two were being considered missing. https://ricardobvjym.wizzardsblog.com/34087275/how-u31-can-save-you-time-stress-and-money