| June 1943 – May 1945|
| Nazi Germany|
| Korvettenkapitän Rolf Rüggeberg|
World War II, Battle of the Atlantic
Reichsmarine, Shayetet 13, Imperial German Navy, Israeli Navy, German Navy
The 13th U-boat Flotilla (German 13. Unterseebootsflottille) was a World War II U-Boat unit of Nazi Germany's Kriegsmarine stationed in Trondheim, Norway. The emblem of the unit was a cross with a Viking ship in the middle.
13th U-boat Flotilla Wikipedia
In 1941, construction of the DORA 1 submarine base started in Trondheim. Two years later, in June 1943, it was handed over to the flotilla commander, Korvettenkapitän (later Fregattenkapitän) Rolf Rüggeberg. The 13th submarine flotilla was a front line unit, and a total of 55 Type VIIC and VIIC/41 served with it until the end of the war in May 1945.