Question: 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? 
Sentence (from "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.
Relevant evidence: Yes