And while officials continue to deny encounters with mysterious aerial phenomena, a resurfaced CIA document suggests the government may have identified extraterrestrial beings decades ago.

In the 1970s and 80s, the CIA conducted experiments with individuals who claimed they could perceive information about distant objects, events, or people — a process known as 'remote viewing.'

One such report, titled 'Description of Personnel Associated 'ET' Bases,' detailed a session in which a remote viewer was given unknown targets and asked to describe what they perceived.

The document describes alleged alien bases located in Alaska, South America or Africa, and on Titan, Saturn's largest moon.

'So far have run into three types of entities associated with bases at various locations within the solar system,' the test subject wrote.

The remote viewer also reported seeing 'entities' at these sites. One was said to have 'a very large, rounded-shaped head' and 'very unhuman appearance,' while another was described as 'very pale' with a 'sharp nose.'

But the Titan base appeared to be staffed with human scientists, including 'an attractive female.'

The remote viewing session was part of the CIA's top-secret STARGATE program, which recruited individuals believed to have psychic abilities for military and intelligence purposes during the Cold War. 

The program began in the early 1970s and officially shut down in 1995 after being deemed scientifically unreliable and operationally ineffective for intelligence gathering.

The report on extraterrestrial bases was produced in 1987 and later declassified in 2000. 

During a remote viewing session, participants typically sketched what they 'saw' and jotted down brief notes about their perceptions.

The 12-page document includes several drawings believed to depict the locations of these ET bases—one sketch appears to resemble a rocky mountain.

That drawing has been interpreted as Mount Hayes in Alaska, which stands roughly 8,000 feet tall.