A TOP secret US Air Force base contains a vast complex of underground tunnels and vaults filled with living and dead aliens, a former worker at the site has claimed.

Raymond Szymanksi believes the UFOs and aliens from the infamous 1947 Roswell incident were bought to the Wright-Patterson Air Force Base (WPAFB) in Dayton, Ohio for inspection and kept in secret tunnels.

15 The Wright-Patterson Air Force Base in Dayton, Ohio (pictured) houses a vast complex of vaults filled with living and dead aliens, according to a former engineer Credit: Glen McCurtayne

The extra-terrestrial researcher, who worked as an engineer and senior scientist at WPAFB for 39 years, detailed the full extent of the "alien" activity at the base in a book called 50 Shades of Greys.

Szymanski, who is the first person to break rank and publicly talk about the “secrets” of the base, heard of the alien conspiracy during his first week at the base.

He claims his mentor Al asked him, "Have you heard about our aliens?", as he showed him around.

Szymanski claims Al went on to tell him there was a there was a system of tunnels and vaults underground at the WPAFB housing both living and deceased extra-terrestrial beings.

Speaking exclusively to the Sun Online, he said: “I was assigned to the Avionics Laboratory's Management Operations Office to work with my mentor Al, an industrial engineering and MBA graduate.

“During my first week, Al provided me with some totally unexpected and unsolicited sage advice.

15 Raymond Szymanksi believes the UFOs and aliens from the infamous Roswell 1947 Roswell incident were bought to the top-secret US base Credit: Glen McCurtayne

15 In 1947 the military claimed they had recovered a "flying disc", which had crashed in Roswell, New Mexico, but later retracted the statement (pictured, an alien conspiracy theorists believe was recovered from the site) Credit: Guzelian

“He said that in 1947 there was a crash down in Roswell and they brought the machines and the aliens here for inspection and said they keep them in secret tunnels under the base.

“When I asked him how he came to know about the secret, he responded, 'Everybody who works on base knows’.

“I was stunned. Me, a young co-op student barely into his first week, was now initiated into a small select group of 10,000 people and given their most incredible secret ever - that we have aliens and their craft in our tunnels on our base.’”

15 Szymanski claims this disc-shaped structure on the Ohio base is an ancient burial ground and believes its size and shape is no coincidence Credit: Glen McCurtayne

15 The engineer, who later became an extra-terrestrial researcher, claimed his mentor Al told him that the Roswell aliens were taken to the base for testing Credit: Glen McCurtayne

15 He said: “I was stunned. Me, a young co-op student barely into his first week, was now initiated into a small select group of 10,000 people and given their most incredible secret ever" Credit: Glen McCurtayne

15 The former worker also said Building 219 on the base was previously used as a paediatrics clinic and a "creepy" high chair is still in the basement Credit: Glen McCurtayne

Following the bizarre conversation Szymanski began to carry out research into the “secret” UFO and extra-terrestrial activity at WPAFB.

He discovered that The Foreign Technology Division (FTD) on the base housed Project Blue Book, the Air Force's official UFO investigation project from 1952 -1969.

“For the next four decades I had dozens if not hundreds of brief conversations regarding the 'secret' I'd been given during my first week on base,” he said.

15 In a witness interview that resurfaced in June this year, a police officer claimed he saw soldiers "hauling away a creature" from the crash site Credit: Guzelian

“The important fact established here is that not one single person at that time ever said, ’We have no aliens here, you crazy son of a b*tch’... I saw lots of smiles but no denials.'

“I’ve been basically investigating locations on the base that I think could contain clues to its history relative to extraterrestrials and UFOs ever since.

“By looking at evidence, which I document in the book in text and photographs, it would appear to me as if the stories are true.”

What is the Roswell Incident? The 1947 Roswell incident is one of the most discussed and controversial UFO theories in history. On 8 July, Roswell Army Air Field revealed they had found a "flying disc", which had crashed in the New Mexico deesert. But the next day they retracted the statement and said the disc was just a damaged US Air Force balloon. In a witness interview that resurfaced in June this year, a police officer claimed he saw soldiers "hauling away a creature" from the crash site. US Deputy Sheriff Charlie Forgus said: "When we got there, the land was covered with soldiers. They were hauling a big, creature. "The bodies must have been 5 feet tall." The police officer said the flying object was "100ft across" and claimed there were as many as four hundred soldiers in the area. Szymanski claims the aliens found at the crash site were housed in secret underground tunnels on the Wright-Patterson Air Force Base in Datyon, Ohio.

15 The former engineer also showed a note written by his mentor Al, where he is believed to have mentioned "flying" Credit: Glen McCurtayne

Szymanski says he’s seen the tunnels and vaults in which aliens - or "greys" - could be kept but as he’s never seen an actual alien he can’t be sure if they are still on the base.

The engineer believes that state-of-the-art climate-controlled facilities and deep underground cyrogenic chambers were built at WPAFB to preserve debris, alien technology artifacts, and corpses recovered from UFO crash sites.

According to UFO researchers, leaked documents and whistleblower reports as many as 14 to 16 alien corpses were transported to WPAFB.

15 Pictured, a photo from the Air Force's "The Roswell Report," released in June 24, 1997, which discusses the UFO incident in Roswell Credit: Air Force

15 In a photograph from 1947, Air Force General Roger Ramey is seen holding debris which is believed to have come from the Roswell incident Credit: Glen McCurtayne

Though Szymanski never encountered any of these greys himself, he claims to have had three separate encounters with real-life "Men In Black" type characters on and around the Dayton base.

He said the men wore black suits and black hats even in the middle of an Ohio summer and spied on him on three occasions.

Szymanski believes the main job of these men is to steal evidence that researchers like himself have acquired on aliens and UFOs, and that they are most likely part of a government agency.

15 The extra-terrestrial researcher, who worked as an engineer and senior scientist at WPAFB for 39 years, detailed the full extent of the "alien" activity at the base in a book called 50 Shades of Greys Credit: Glen McCurtayne

15 The military's statement about the Roswell "flying disc" hit headlines in 1947, before they mysteriously changed their account Credit: Glen McCurtayne

Apart from the underground tunnels, Szymanski also believes there are four potential burial sites on the AFB grounds where aliens have been buried.

Szymanski has pictured one of the sites in his book where, he says, it is quite possible that a 4ft tall alien grey has been laid to rest standing in a vertical standing position as opposed to laying horizontally, as is customary for humans.

Szymanski also suggests that the bodies of eight aliens are buried under a car park next to the Foreign Technologies Division for UFO Reverse Engineering.

15 The former scientist claims to have had three separate encounters with real-life "Men In Black" type characters on and around the Dayton base

The Roswell incident has fascinated UFO hunters and conspiracy theorists ever since the US military announced in a press release they had found the remains of a crashed flying saucer in the New Mexico desert in July 1947.

The following day officials retracted the statement but witnesses came forward to say they saw alien bodies with the crashed craft which were taken away - something the US government has always denied.

Szymanski believes governments have good reason or keeping the existence of aliens under wraps - to keep us safe.

15 Szymanski believes governments have good reason or keeping the existence of aliens under wraps - to keep us safe Credit: Glen McCurtayne

He said: "We still aren’t ready for full disclosure, the governments like to keep secrets cause that’s what keeps us safe sometimes.

"The last time the Air-Force made the announcement ‘hey we’ve got a flying saucer’ that didn’t go so well, so what would happen if they announced it this time?

"I really don’t see a change, I don’t think the fact that we have cell phones or 150,000 cable TV channels will make us any more prepared than the people were in 1947 after Roswell.”

Szymanski knows his theories may sound far fetched but he says he just wants to document his research and let people decide for themselves.

He said: “I present new theories, I show you evidence and I let you make up your own mind."

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