Elizebeth Saves the Queen Mary | The Codebreaker | American Experience | PBS

Summary

The main theme is the critical role of codebreaking in countering German espionage and U-boat activity in South America during WWII. Key subjects include German emigration, fascist movements, and the decoded messages of Johannes Siegfried Becker (Sargo), the SS's South American operative. The practical takeaway is that Elizebeth's decryption of Sargo's transmissions directly protected Allied supply ships, like the Queen Mary, and helped sink numerous U-boats, tipping the balance in the Atlantic.