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Uncover the untold story behind one of the greatest intelligence failures in history — how Nazi Germany never realized the Allies had cracked their supposedly “unbreakable” Enigma code. For three decades after World War II, German commanders, including Admiral Karl Dönitz, believed they were defeated by Allied radar and overwhelming resources. The shocking truth, revealed only in 1974, exposed that British codebreakers at Bletchley Park had been secretly reading every encrypted German military message since 1940.

This gripping, meticulously researched documentary reveals how over 783 U-boats were sunk, 30,000 submariners lost their lives, and countless operations collapsed — all because of Germany’s blind faith in the mathematical security of Enigma. Drawing on declassified wartime files, firsthand survivor accounts, and expert analysis, it retraces how Polish mathematicians first broke Enigma in 1932, how Alan Turing’s revolutionary Bombe machines automated the codebreaking process, and why multiple German investigations ignored clear evidence of compromise — even after warnings from Swiss intelligence.

Featuring the emotional 1978 confrontation between former enemies and Dönitz’s stunned reaction upon learning the truth, this film exposes how arrogance, secrecy, and misplaced confidence created one of history’s most devastating intelligence disasters — one that may have shortened the war by up to four years and saved millions of lives.

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Primary Sources:
F.W. Winterbotham – “The Ultra Secret” (1974) – First public revelation of the Enigma codebreak
Admiral Karl Dönitz – War Diary Entries (notably January 12, 1942, regarding U-459 interception)
Nuremberg Trial Transcripts (1946) – Dönitz’s testimony attributing U-boat losses to radar, not cryptanalysis
TICOM (Target Intelligence Committee) Reports – Postwar interrogations of German cryptographers, including Dr. Erich Hüttenhain

Key Historical Documents:
B-Dienst “Hundred-Day Project” (Hundert-Tage Arbeit) – German attempt to verify Enigma’s security
Swiss Intelligence Report – August 10, 1943 – Warning that German naval ciphers were compromised (ignored by Dönitz)
Captain Ludwig Stummel Investigation (1941) – Security review following U-110 capture
Mavis Batey Decrypt – March 25, 1941 – Breakthrough that led to the British victory at Cape Matapan

Statistical Data:
German U-boat losses: 783 submarines destroyed, 30,000 casualties (≈75% of all personnel)
“Black May” 1943: 41 U-boats sunk in a single month
Luftwaffe losses: 76,875 aircraft destroyed during WWII
Daily Enigma decrypts by D-Day: approximately 5,000 messages
Bletchley Park workforce: over 9,000 personnel by 1945 (≈80% women)

Secondary Analysis & Historical Context:
Sir Harry Hinsley – Official historian of British Intelligence; concluded Ultra shortened WWII by 2–4 years
1978 Ultra Conference (Germany) – First postwar meeting between Allied and Axis intelligence veterans