A show that aired in February claimed that the Apollo 10 mission encountered mysterious music or an alien signal while on the dark side of the moon.
According to a Discovery News story, “The astronauts who flew the dress rehearsal for the first lunar landing reported hearing mysterious ‘outer space-type music’ while flying behind the moon in May 1969. The case of the odd, unexplained whistling noise is uncovered during an upcoming episode of the Science Channel series, NASA’ s Unexplained Files.”
The Apollo 10 astronauts can be heard on the tapes mentioning the odd sound, which lasted nearly an hour. Some reports even suggested that there was an attempt to keep the event a secret: “The Apollo 10 astronauts—Tom Stafford, John Young and Eugene Cernan— can be heard on recordings from the flight talking about the strange sound, and whether to tell NASA about it.” This speculation—predictably—spurred conspiracy theorists who claim the recordings as the latest smoking gun evidence of a UFO coverup.