Astronauts sent on a mission to the moon were so baffled by their encounter with 'space-type' music, they were unsure on whether or not to even inform NASA of their experience.
A couple of months before Neil Armstrong's historic 1969 landing, astronauts were sent to orbit the moon as a "dress rehearsal" for the first moon landing.
While the crew of Apollo 10 were on the far side of the moon, they were out of range of Earthly radio transmissions for about an hour.
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Everyone on Earth thought the mission went flawlessly, but those aboard the capsule knew something weird had happened.
Their radio transmission was recorded so it could be listened to later on. NASA transcribed them and buried them.
Four decades later, the recordings from the dark side of the moon have now been uncovered.
"You hear that? That whistling sound?" one of the crew members asks.
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Another astronaut says: "It sounds like, you know, outer space-type music."
"Well, that sure is weird music," his companion agrees.
In the upcoming third season of NASA's Unexplained Files, astronaut Al Worden says: "The Apollo 10 crew was very used to the kind of noise that they should be hearing. Logic tells me that if there was something recorded on there, then there was something there."
The show takes a look at possible explanations, such as magnetic field or atmosphere interfering with radio signals. But experts say the moon has no magnetic field or enough atmosphere to cause such a strange music-like sound.
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The origins of this 'music' will, for now, remain a mystery. And no, it wasn't Pink Floyd.
NASA's Unexplained Files returns to the Science Channel on February 23rd.
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