Which country was defeated during World War II that had a submarine in its service called the U-666?
German submarine U-666 German submarine "U-666" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II.
German submarine U-78 (1940) German submarine "U-78" was a Type VIIC submarine of Nazi Germany's "Kriegsmarine" during World War II. She was the only German submarine to be sunk by land-based artillery fire during the war.