A third batch of UFO files was released by the Pentagon on Friday morning.

The document drop included recorded NASA briefings after Apollo 16, which referred to an 'alien starbase' on the dark side of the moon. The comments were not included in the official transcript from the 1972 mission.

Among the most bizarre releases was a 1958 CIA memorandum discussing a phone conversation with a scientist regarding concerns about a destroyed 'space message and its transmitter.'

The scientist, Dr Leon Davidson, was a chemical engineer who worked on the Manhattan Project and at Los Alamos, and studied UFOs.

The third set of documents was quietly uploaded to the Department of War's website on the same day as the release of the Hollywood blockbuster Disclosure Day.

According to the Pentagon, there have been 'unprecedented levels of interest' in the UFO files, with the website receiving more than 1.7 billion hits worldwide since it launched in May.

The latest trove adds dozens of documents, photographs and videos to the government's rapidly expanding public archive of unexplained sightings.

Follow along for the latest updates. 

NASA audio hidden for decades reveals discussion about an 'alien base' on the moon

Audio from a secret NASA meeting following the Apollo 16 mission has been released as part of the third batch of UFO files, revealing a discussion about a possible 'alien base' on the moon.

Apollo 16 flew from April 16 to April 27, 1972, and saw astronauts John Young and Charles Duke become the first humans to explore the moon's rugged highlands while Thomas 'Ken' Mattingly remained in lunar orbit.

Buried within the 55-minute discussion is a brief exchange about unusual gravity readings, laser measurements and unexplained anomalies detected on the moon's far side.

The speakers focus on what one participant describes as a 'great big hole' near the Van de Graaff crater, a distinctive lunar formation known for unusual magnetic and geochemical characteristics.

'In the backside of the moon around Fendi graph, that's where we get our big hole,' one speaker says.

The discussion then takes an unexpected turn.

'It could be an alien star base or something. Anyway, the next slide shows the front side of the moon.'

The remark appears amid a broader technical discussion of lunar data and anomalies, although the context of the comment remains unclear from the audio alone.

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