In 1969, two months before Apollo 11's historic landing on the moon, the Apollo crew encountered strange music-like radio transmissions coming through their headsets, recordings have revealed.
Four decades after the landing, lost recordings emerged revealing "strange, otherworldly music coming through the Apollo module's radio," according to the upcoming Science Channel series, "NASA's Unexplained Files".
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A taped conversation between the three astronauts indicated they heard mysterious sounds which they never reported. It was during the time Apollo 10 entered lunar orbit, which included traversing the far side of the moon when all spacecraft are out of radio contact with Earth for about an hour and nobody on Earth can see or hear them.
As far as the public knew, everything about the mission went smoothly.
However, in the recordings, one of the crew members is heard saying: "It sounds like, you know, outer space-type music."
"You hear that? That whistling sound? Whooooooooo!"
"Well, that sure is weird music!"
The unexplained "music" lasted almost an hour. The astronauts are also heard contemplating whether they should report the strange music to Mission Control, once they regained radio contact with Earth.
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"It's unbelievable! You know?"
"Shall we tell them about it?"
"I don't know. We ought to think about it."
Apollo 15 astronaut Al Worden says on the Science Channel programme, "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."
"NASA would withhold information from the public if they thought it was in the public's best interest," he added.
The transcripts of the Apollo 10 mission were classified and untouched in NASA's archives until 2008, producing an ongoing debate as to the nature and origin of the strange sounds heard by the astronauts.
"You don't hear about anything like that until years after the incident occurs, and then you kind of wonder, because it's such an old memory of those things that you get concerned about if they were making something up or was there something really there? Because you never really know," Worden told The Huffington Post.
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"If you're behind the moon and hear some weird noise on your radio, and you know you're blocked from the Earth, then what could you possibly think?" Worden said.
"We'd had a lot of incidents where guys who flew in space saw and heard things that they didn't recognise, and you wonder about all of that. I have a very open mind about what could've happened. It's somebody's hearsay evidence – it's only a visual or audio event, which is hard to pin down. Recollection is one thing, but actual proof is something entirely different," he added.
This article originally appeared on Huffington Post.
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