Numbers stations are mysterious, unsettling, and one of the strangest things you'll ever hear. They're shortwave radio stations that send coded messages to undercover spies all over the world—an odd ...

“Calling all. This is our last cry before our eternal silence.” With that, in January 1997, the French coast guard transmitted its final message in Morse code. Ships in distress had radioed out dits ...

In the second week of December, a Cold War–era Russian shortwave radio station broke from its usual pattern. Over the course of several days, UVB-76, better known as “The Buzzer,” transmitted an ...