The Type seven and Type nine were the striking force of the Kriegsmarine during the Battle of the Atlantic - a German attempt to cut off the British Isles and force the Allies to surrender.

The U-boat with the longest operational service in World War II, spending 750 days at sea during 13 patrols from January 1941 to August 1944. She sank 38 ships totaling 217,751 tons, including 14 ...