What was the famous film and TV series featuring U-Boat commander Alfred Radermacher?
Alfred Radermacher Alfred Radermacher (13 Sep 1913 - 1994) was a career officer of both the Reichsmarine and Kriegsmarine who served as a navigator, and later commander, of German U-boats during the Second World War. He is best known for serving as navigator of U-96 during its 7th war patrol which was documented by naval war correspondent Lothar-Günther Buchheim. Radermacher was subsequently portrayed in both the novel and film versions of the war patrol, known as "Das Boot".
Walther Schwieger Kapitanleutnant Walther Schwieger (7 April 1885 – 5 September 1917) was a U-boat commander in the Imperial German Navy ("Kaiserliche Marine") during First World War. In 1915, he sank the passenger liner  with the loss of 1,198 lives.