Secret police audio files from the Pascagoula Abduction could prove that the men who claimed to be abducted by aliens were actually telling the truth, according to British ufologist (yes, that's a real title, believe it or not) Philip Mantle.

The tapes feature conversation between fishermen Charles Hicken and Calvin Parker, who said they had been captured by three alien creatures before eventually being released.

The incident took place in October 1973 when the two men - aged 42 and 19 at the time, respectively - were fishing near Pascagoula, Mississippi. They claim they heard a strange whizzing sound overheard, and then saw a levitating oval-shaped spacecraft.

A door opened and out came three 'humanoid' creatures with lobster-like claws and carrot-like growths in place of noses and ears.

When the creatures seized them, both men reported that they went numb and paralysed, and Calvin said he fainted from fear.

"I've got to get home and get to bed or get some nerve pills or see the doctor or something. I can't stand it. I'm about to go half crazy," Calvin is heard saying in the tape.

"I tell you, when we're through, I'll get you something to settle you down, make sure you get some damn sleep," Charles replies.

"I can't sleep yet like it is. I'm just damn near crazy."

"Well, Calvin, they brought you outta that damn thingy. They brought me out. God damn I like to know how they got you straightened out, man."

"My damn arms, they hardly moved. My arms, they just froze up and I couldn't move. Just like I stepped on a damn rattlesnake."

"They didn't do me that way though, they-"

Charles claimed that he was examined by what looked like a large mechanical eye that scanned his body, The Sun reports, while Calvin claimed that he couldn't recall much of what happened.

In the audio, Calvin continues to tell Charles: "I passed out. I expect I never passed out in my whole life."

"I've never seen nothin' like that before in my life. You can't make people believe in that though."

"I don't wanna sit here and start [inaudible]."

"They better wake up and start believin'. They better start believin'."

Calvin starts to talk about the specifics of what they saw, saying: "I can't figure out...You see how that damn door come right up?"

"I don't know how it opened, son. I don't know," Charles replies.

"[Inaudible] you look around in front of your very eyes, those sons of bitches, just like that they come out."

"I know. You can't believe it. You can't make people believe it."

"I paralysed right there. I couldn't move."

FISHERMAN FINDS CREEPY ALIEN BARNACLE

UFO researcher Mantle refers to it as one of the 'most unique close encounters on record', and has insisted that the audio footage proves the two men weren't lying.

"They gonna believe it one of these days. They gonna believe it one of these days. Might be too late," Charles says. "I knew all along there was people from other worlds up there. I knew all along. I never thought it would happen to me."

"You know yourself I don't drink," Calvin replies.

"I know that, son. When I get to the house I'm gonna get me another drink, make me sleep. Look, what we sittin' around for? Look, what we waitin' on? I gotta go tell Blanche, son. I'll just say we had to [inaudible]."

"I gotta get to the house. I don't sit here being treated like a fool. I'm getting' sick. I gotta get go to the house."

Mantle, who was once a director of investigations for the British UFO Research Association, said that the unique close encounter had fallen by the wayside and has been 'largely forgotten' to many UFO researchers.

"It was with that in mind that in late 2017 I reached out to Calvin Parker and I re-published the book on this fascinating event," Mantle explained.

"I have also been asked by a colleague who works in the film and TV industry to consider a movie based on the experience of Charles Hickson and Calvin Parker.

"Irrespective of that there is no doubt that this is one of the most unique close encounters on record."