Comment by lysace

Supposedly like this: https://www.youtube.com/watch?v=OvR4qK0B--w&t=517s

(I see now that it was already linked elsewhere in the the thread.)

Pretty impressive for cross atlantic one-time pad voice comms in an analogue era, I think. It's amazing what money and smart people can accomplish.

Also found this fantastic page: https://www.cryptomuseum.com/crypto/usa/sigsaly/