Lost Apollo 10 tapes recently showed on The Science Channel series, “NASA’s Unexplained Files,” gives a glimpse into an odd experience that the astronauts had on their voyage. The astronauts heard strange noises that had a music-like melody and had no clue where the noise was coming from.

In the recording, you can hear a conversation between

The conversation between the three astronauts indicated they heard sounds like they had never heard before:

“It sounds like, you know, outer space-type music,” one astronaut can be heard saying.

“You hear that? That whistling sound? Whooooooooo!,” another said.

“Well, that sure is weird music!” one said.

The sound lasted for an entire hour, but the astronauts were unsure as to whether or not they should tell mission control. They were likely afraid of someone back home thinking they were crazy.

“It’s unbelievable! You know?”

“Shall we tell them about it?”

“I don’t know. We ought to think about it.”

On the Science Channel show, Apollo 15 astronaut Al Worden suggested that “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.”

In a later interview with Huffington Post, Worden said, “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. 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 recognize, 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,” Worden added.

When the story went viral, NASA issued a statement saying that this recording is no big deal. The agency claims that these recordings were not lost and have actually always been available to the public. They have explained away the sounds by saying that it was simply radio interference.

“While listed as ‘confidential’ in 1969 at the height of the Space Race, Apollo 10 mission transcripts and audio have been publicly available since 1973. Since the Internet did not exist in the Apollo era, NASA has only recently provided digital files for some of those earlier missions,” the statement said.

Apollo 10 Lunar Module Pilot Gene Cernan now says that he didn’t think much of the noise at the time.

“The Apollo 10 audio clips were uploaded in 2012, but the mission’s audio recordings have been available at the National Archives since the early 1970s. As for the likely source of the sounds questioned in the television program, ‘I don’t remember that incident exciting me enough to take it seriously. It was probably just radio interference. Had we thought it was something other than that, we would have briefed everyone after the flight. We never gave it another thought,” Cernan said.

Last month, AnonNews.co reported that scientists are picking up repeated, unnatural-seeming radio signals from deep space. Speaking on the fact that they noticed the burst repeat itself six times from the same location, University of British Columbia astrophysicist Ingrid Stairs said:

“Until now, there was only one known repeating FRB [fast radio burst]. Knowing that there is another suggests that there could be more out there. And with more repeaters and more sources available for study, we may be able to understand these cosmic puzzles — where they’re from and what causes them.”

Arun Naidu of McGill University noted that whatever the source of these frequencies, it can be very compelling to notice the range of frequencies it can produce. “There are some models where intrinsically the source can’t produce anything below a certain frequency,” Naidu said.