Dee ihe na-aga n'ihu maka paragraf a - Na 1941, a malitere iwu ebe ụgbọ mmiri DORA 1 dị na Trondheim. Afọ abụọ mgbe e mesịrị, na June 1943, e nyere ya onye isi ụgbọ mmiri, "Korvettenkapitän" (mgbe e mesịrị "Fregattenkapitän") Rolf Rüggeberg. 13th submarine flotilla bụ otu n'ihu, na ngụkọta nke 55 Type VIIC na &lt;a href="German%20Type%20VII%20submarine%23Type%20VIIC.2F41"&gt;VIIC/41&lt;/a&gt; jere ozi na ya ruo ọgwụgwụ nke agha
N'ọnwa Mee afọ 1945.