During WWII, a common way to ensure that a safe house was convenient to visit, was by a phone call. But how could you tell that the safe house was not compromised when you couldn’t see who was on the other side of the line?
Well, here’s what they did.
In order to ensure that the person answering the phone was not being coerced by one or more hostile invaders, a kind of duress code was being used (mainly by the British World War II organisation called the Special Operations Executive). If it was safe to visit, the answer would be “No, I’m too busy”. If, however, the safe house had been compromised by the Nazis, the captured agent would reply “Yes, come on over”, actually warning the person calling not to visit the safe house and take appropriate action.
If you like what you read, then you will definitely love this one: This Double Agent Was So Good In Trolling Nazis, He Won Both The Iron Cross And The British MBE
Photos: Chronicles of the Vilna Ghetto, Fine Art America
Photoshop: I’m A Useless Info Junkie
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