Fregattenkapitän Heinrich Lehmann-Willenbrock was a submarine commander in Germany during World War II and the subject of the mini-series called "Das Boot" when he was portrayed by which actor? 
Heinrich Lehmann-Willenbrock:  The story of the "U-96" was eventually made into a mini-series and film called "Das Boot", in which he was portrayed by Jürgen Prochnow.
i don't know