Mezue ahịrịokwu na-esonụ: N'afọ 1941, a malitere iwu ebe a na-arụ ụgbọ mmiri okpuru mmiri DORA 1 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 mgbe
Agha ahụ biri na Mee 1945.