There was no recorded wreck at this locale so it was reported into the applicable authorities, such as the Receiver on the Wreck (RoW). They were being regarded as outstanding boats. Over the war 8 have been sunk, three surrendered and were being ultimately scrapped, and two were regarded lacking. https://eduardoaaxrk.blogocial.com/the-smart-trick-of-u31-that-no-one-is-discussing-69883716