The documents, described as containing internal memos, scientific reports and images, were allegedly discovered among the belongings of the former head of cybersecurity at Los Alamos National Laboratory (LANL).

The lab, located in northern New Mexico, approximately 35 miles northwest of Santa Fe, is linked to UFO lore primarily through its proximity to New Mexico's 'Nuclear Triangle' and reported sightings of 'green fireballs' near atomic sites in the late 1940s. 

After the official's death, his son Johnny was sorting through personal effects when he reportedly stumbled upon files labeled with references to 'atmospheric anomalies.' 

The identities of the deceased staff member and his son are being withheld to protect their privacy and safety. 

The discovery was later passed to investigative journalist Jeremy Corbell, who said the contents shocked even him. 'This is a real scientific study at the classified level within our military of UFOs,' he told the Daily Mail.

Corbell, who featured the details in his new documentary Sleeping Dog, set for release on May 12, claimed the material included records of high-level government meetings and scientific studies linked to UFO propulsion systems.

'Los Alamos was always a place where there were elements of the study of the UFO phenomenon… these documents are 100 percent proof that Los Alamos was taking it very seriously,' Corbell said.

The case is now drawing renewed attention to LANL, a laboratory long associated with nuclear weapons development and deep government secrecy.

As a premier nuclear research facility, LANL has been connected to Cold War atmospheric surveillance, classified aerial research and conspiracy theories regarding retrieved technology, including unverified worker claims of alien materials stored in hidden warehouses.

According to Corbell, the discovery began when the cybersecurity chief's son began reviewing stored materials left behind after his father's death.

'This kid, after his dad passed away, starts going through and realizes, "oh, this is some heavy stuff,"' Corbell said.

In Corbell's Sleeping Dog, a film by Michael Lazovsky, he receives a package from Johnny, bursting with files reportedly from LANL.

Johnny told Corbell on the phone that the files included 'official documents from the lab that talk about meetings they had about atmospheric anomalies.'

'There's also some information in there about Russian sightings,' Johnny can be heard saying to Corbell over the phone.

Corbell told the Daily Mail: 'I mean, everything from original Polaroids of very studied UFO cases throughout history, to internal memos and documents of when they have meetings and they're discussing this at a high-level government capacity.'