Phantom Signals

When two experts build their own radio-listening station to intercept the secret communications of American and Soviet astronauts, they capture traces of a haunting voice that may be a lost Russian cosmonaut.

A Russian radio station has broadcast a signal nonstop since the Cold War, and no one knows why; experts use hi-tech methods to investigate what it is and what might happen if it ever stops.

When someone picks up a radio distress call from a seven-year-old boy lost alone in the desert, authorities embark on a search-and-rescue mission to find him; as the hunt continues, the case becomes more and more mysterious.

When a US Air Force intercept aircraft chases after a UFO, it vanishes forever without a trace. A new investigation tries to uncover what caused this mysterious disappearance.

Cameras capture an entire city floating in the sky, a signal comes from under a tiny island off the coast of Africa, and a powerful radio beam from deep space reaches Earth only to vanish and never return.

A mysterious flash detected by a US satellite puts authorities on high alert.