A trove of documents from the now-dead cybersecurity chief of Los Alamos National Laboratory — where two of the 11 missing or dead US scientists worked — purport to show that the US government secretly conducted UFO-related experiments for decades, according to a new documentary.

Reporter Jeremy Corbell claims in the upcoming flick “Sleeping Dog” that he received the valuable classified documents from the son of the deceased ex-cybersecurity chief at the highly secretive New Mexico lab.

“Throughout my work as a journalist, I have become a central clearinghouse for sensitive [Unidentified Aerial Phenomena] material in my reporting,” Corbell said to The Post.

“It is now routine for families of deceased insiders to contact me with hidden documents their loved ones left behind,” he said.

“This kid, after his dad passed away, starts going through [his effects] and realizes, ‘Oh, this is some heavy stuff,” Corbell said in the documentary, which was previewed by The Post.

“I start noticing, I know some of the names. I know some of the scientists personally. They’ve never told me that they did these studies on UFOs,” said Corbell.

The identities of the lab chief, his son, and the scientists are withheld in the documentary for safety concerns. The film is slated for release May 17.

The out-of-this-world leak contains internal memos, drawings, and Polaroids, according to Corbell.

“These documents provide absolute confirmation that the US government has maintained a secret, decades-long program to uncover the intent and origins of those piloting UFOs,” Corbell said.

One document shows the agenda of a high-level, all-day meeting on April, 24,1991 at Los Alamos where representatives from the Central Intelligence Agency, National Security Administration, Navy, and Army met to discuss the investigation into “Atmospheric Anomalies.”

The discussion included the 1987 Gulf Breeze UFO incident in Florida and the Belgian UFO wave in 1989, the document lays out.

Other issues addressed in the meeting were “Soviet offerings,” the “development of sensors,” and how to “interface with the civilian sector, i.e. Universities such as MIT and Stanford.”

The highly secretive Los Alamos National Lab, founded by father of the atom bomb Robert Oppenheimer, has had two former employees vanish without a trace within the last year.

Retired engineer Anthony Chavez was last seen in May 2025 when he disappeared while going for a walk. The 78-year-old left both his wallet and keys at home and his body has not been found, despite weeks of searching.

New trailer released for upcoming documentary about UFO investigator Jeremy Corbell titled "Sleeping Dog"

"I've been holding a secret for 11 years.

It's not a video of an alien, it's not a video of a craft, it's more than that." pic.twitter.com/vHhxkiLQo7

— Red Panda Koala (@RedPandaKoala) April 15, 2026

Melissa Casias, 39, worked as an administrative assistant at the lab and disappeared in June 2025 after dropping lunch off for her daughter.

Casias, whose husband also works at Los Alamos, was last seen on surveillance footage walking along a highway alone.

Both Casias’ home phone and work phone were reset to factory setting and left at her home, according to authorities.

Missing Air Force Gen. William McCasland, who was a “gatekeeper” one the UFO subject, had indirect ties with Los Almost National Laboratory due to his oversight of nuclear research programs which are conducted at the lab.

President Trump acknowledged the troubling trend of missing US scientists on April 16, saying to reporters from the South Lawn, “I hope it’s random.

“Some of them were very important people, and we’re going to look at it over the next short period.”