Passage: Kriegsmarine Commander of Submarines (Befehlshaber der U-Boote) Karl Dönitz ya tsara shirin kai hari kan Scapa Flow ta jirgin ruwa a cikin kwanaki na barkewar yaƙi. Manufarsa za ta kasance sau biyu: na farko, cewa kawar da Gidan Gida daga Scapa Flow zai sassauta toshewar Tekun Arewa na Burtaniya kuma ya ba Jamus 'yanci mafi girma don kai hari ga rundunonin jiragen ruwa na Atlantic; na biyu, bugun zai zama aikin fansa na alama, yana bugawa a daidai wurin da Jirgin Ruwa na Tekun Jamus ya mika wuya kuma ya nutse kansa bayan nasarar Jamus a Yaƙin Duniya na Farko. Dönitz ya zaɓi Kyaftin Gunther Prien don aikin, ya shirya kai hari a daren 13/14 ga Oktoba 1939, lokacin da za a yi amfani da hasken rana da hasken rana.
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