Meet U 505, one of six German submarines captured by Allied forces in WW2 and one of only four surviving.
For reasons of secrecy (her codebooks had been captured) her crew were held incommunicado, denied access to the Red Cross and interned until 1947, the Geneva Convention notwithstanding.
She was built by Deutsche Werft who later became Howaldtswerke-Deutsche Werft and later still part of Thyssen-Krupp Marine Systems who still make submarines.
Her engines are from MAN who still make those too.
Want to visit her? She’s at the Museum of Science and Industry in Chicago.