There was no recorded wreck at this spot so it had been noted for the relevant authorities, including the Receiver of the Wreck (RoW). They have been considered excellent boats. During the war 8 were sunk, 3 surrendered and had been inevitably scrapped, and two have been considered missing. Now https://u3124421.newsbloger.com/34785044/the-basic-principles-of-u31