Mezue ahịrịokwu na-esonụ: N'oge Agha Ụwa nke Abụọ, e kenyere Nigel de Grey ọrụ na "Government Code and Cypher School" (GC&amp;CS) na Bletchley Park, ebe o lekwasịrị anya na okporo ụzọ ndị Germany ezoro ezo na igwe Enigma cipher. N'ọnwa Septemba n'afọ 1941, o nyere praịm mịnịsta akụkọ nke mbụ ndị ọchịchị Jamanị kwuru banyere ndị uweojii ha.
na-emebi obodo nta dị iche iche ma na-ekpochapụ ndị bi na ha. Otu ihe mgbaàmà kwuru na e gburu puku mmadụ iri atọ "n'ebe etiti obodo ahụ". N'ịgbaso ịdọ aka ná ntị e nyere n'okwu Churchill gwara nzuko omeiwu, otu akwụkwọ ozi ndị Germany bipụtara n'October 1941 dọrọ aka ná ntị na e kwesịghịzi ikwu banyere "ọrụ ndị dị oké mkpa" n'usoro mgbasa ozi ndị na-adịghị eji eriri eme ihe.