Kamilisha sentensi ifuatayo: Mnamo 1941, ujenzi wa kituo cha nyambizi cha DORA 1 ulianza huko Trondheim. Miaka miwili baadaye, mnamo Juni 1943, meli hiyo ilipelekwa kwa kamanda wa meli hiyo, "Korvettenkapitän" (baadaye "Fregattenkapitän") Rolf Rüggeberg. 13 th submarine flotilla was a front line unit, and a total of 55 Type VIIC and &lt;a href="German%20Type%20VII%20submarine%23Type%20VIIC.2F41"&gt;VIIC/41&lt;/a&gt; served with it until the
mwisho wa vita Mei 1945.