Question: What nationality is the director of film U 47 – Kapitänleutnant Prien?
Sentence (from "U 47 – Kapitänleutnant Prien"): U 47 – Kapitänleutnant Prien  is a 1958 black-and-white German war film portraying the World War II career of the U-boat captain Günther Prien.
Relevant evidence: No