“A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: "What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise."
The scientist gave a superior smile before replying, "What is the tortoise standing on?"
"You're very clever, young man, very clever," said the old lady. "But it's turtles all the way down!"
-Stephen Hawking. A Brief History of Time
49181__mmcdona1__Federal_Signal_Symphony.wav used by permission of www.freesound.org and mmcdona1.
“Turtles” recording is public domain.
“Numbers Stations” are shortwave radio stations of indeterminate origin. They are usually voices (men, women, children, synthetic) reading a stream of letters, numbers, words, or nonsense, sometimes they are repetitive tunes, or Morse Code. Although denied by most of the world’s governments, they are generally accepted as transmissions to spies. They are often associated with “one-time pads,” encryption keys that are used only once and then discarded.
One-time Pad created using the one-time pad generator at http://www.fourmilab.ch/onetime/otpjs.html
Unfortunately, revealing the encrypted message would be a devastating breach of security.