662K views · 648 reactions | During WWII, the fate of the world depended on the codebreakers at Bletchley Park, Britain's super-secret headquarters for cracking the "unbreakable" Enigma machine. Against the odds, these schoolboys, academics, and crossword fanatics turned Germany's greatest weapon into its greatest liability. This fascinating documentary offers first-hand accounts of "Station X" and how they cracked the code. | Timeline - World History | Facebook

When WWI began, the United States military had no code-breaking agency to decode enemy messages and encode their own. Enter Elizebeth and William Friedman. | American Experience | PBS