Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Kriegsmarine Commander of Submarines (Befehlshaber der U-Boote) Karl Dönitz chepụtara atụmatụ ịwakpo Scapa Flow site n'ụgbọ mmiri n'ime ụbọchị ole na ole agha malitere. Ihe mgbaru ọsọ ya ga-adị okpukpu abụọ: nke mbụ, na iwepụ Ụgbọ Mmiri nke Obodo site na Scapa Flow ga-eme ka mgbochi nke Oké Osimiri North nke Britain belata ma nye Germany nnwere onwe ka ukwuu ịwakpo ndị njem ụgbọ mmiri nke Atlantic; nke abụọ, ihe ọkụkụ ahụ ga-abụ ihe nnọchianya nke ịbọ ọ́bọ̀, na-akụ n'otu ebe ahụ Ụgbọ Mmiri Oké Osimiri nke Oké Osimiri German nyefere onwe ya ma mee onwe ya ka ọ daa mgbe e merisịrị Germany n'Agha Ụwa Mbụ. Dönitz jiri aka họrọ Kapitänleutnant Günther Prien maka ọrụ ahụ, na-eme atụmatụ maka mwakpo ahụ n'abalị nke 13/14 Ọktoba 1939, mgbe ebili mmiri ga-adị elu na abalị na-enweghị ọnwa.Dönitz nyere aka site na foto dị elu site na nlegharị anya nke Siegfried Knemeyer, (onye natara obe Iron mbụ ya maka ọrụ ahụ), nke kpughere adịghị ike nke nchebe na ọtụtụ ihe mgbaru ọsọ. Ọ gwara Prien ka ọ banye Scapa Flow site na ọwụwa anyanwụ ya site na Kirk Sound, na-agafe n'ebe ugwu nke Lamb Holm, obere agwaetiti dị ala n'etiti Burray na Mainland. Prien buru ụzọ were Skerry Sound nke dị na ndịda maka ụzọ ahọpụtara na nghọta ya na mberede na U-47 na-aga n'okporo ụzọ na-emighị emi nke gbochiri ya mere ka ọ nye iwu ka ọ gbanwee ngwa ngwa n'ebe ugwu ọwụwa anyanwụ. N'elu mmiri, nke ọkụ na-enwu nke Aurora Borealis na-enwu, ụgbọ mmiri ahụ na-agbanye n'etiti ụgbọ mmiri siri ike siri ike siri ike siri ike na Numidian, na-ejide onwe ya ruo nwa oge na eriri eriri siri ike. Ọ na-adịru nwa oge ka ọkụ ụgbọala na-agba n'ikpere mmiri na-enwu, ma onye ọkwọ ụgbọala ahụ emeghị ka a mara na ọ na-agba. Mgbe ọ banyere n'ọdụ ụgbọ mmiri ahụ n'elekere 00:27 nke ọnwa Ọktoba, Prien banyere n'ọchịchị Wir sind in Scapa Flow!!! n'ime log ma tinye ụzọ ndịda ọdịda anyanwụ ruo ọtụtụ kilomita tupu ịgbanwee ụzọ. O juru ya anya na ebe ahụ ụgbọ mmiri na-akwụsịtụ fọrọ nke nta ka ọ ghara inwe ihe ọ bụla; n'amaghị ama ya, iwu Forbes nyere ka ụgbọ mmiri ahụ gbasasịa ewepụwo ụfọdụ n'ime ihe ndị kasị mkpa. U-47 nọ na-aga n'ihu ụgbọ agha anọ,  Ajụjụ: Gịnị bụ otu mmiri na-ere ọkụ e chekwara n'ụgbọ ahụ?
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