There was no recorded wreck at this area so it absolutely was noted for the pertinent authorities, such as the Receiver of the Wreck (RoW). They were regarded great boats. In the war 8 had been sunk, 3 surrendered and were being eventually scrapped, and two had been regarded missing. https://u3189864.mpeblog.com/59820721/not-known-factual-statements-about-u31