"Marc, who runs a special effects company called FX Models that undertakes Naval contracts, said: “As a thank you for doing some work for them Navy asked me if I wanted to go for a ride in a submarine so I said yes.

“Once we got under I was sitting in the sonar station and the sonar operator was sitting right next to me.

"Submarines are loud – people think they are very quiet and it’s true they are on the outside because the sound doesn’t get out. But inside you hear fans, noise - it’s a constant din on a sub.

“I was sitting there zoning out a little because I was sea sick and all of a sudden the sonar kid shouts 'fast mover, fast mover' and I’m jolted awake – thinking ‘What’s happening? Is it a torpedo?’

“The executive officer comes out and the operator shows him the path of the object and the officer says 'How fast is that going?'

“And the kid said 'several hundred knots'. I start to lean forward to listen in – and the officer said ‘Can you confirm it?’

“So he goes to another sonar machine and confirmed it wasn’t a machine anomaly - it was real. I thought ‘Wow that is incredible’.

“When the sonar guy said ‘What do I do with this?’ the officer said ‘log it and dog it’ - in other words log it and bury it.”

Four years later Marc said he was doing some more contract work for the Navy when he spoke to a senior naval figure about what he saw.

“I asked him ‘Can you tell me about the Fast Mover Programme?'" Marc explained.

“He looked at me and said 'Sorry Marc I can’t talk about that programme'.

“So he basically confirmed to me that the programme exists - he said everything without seeing anything.

“What that told me was that USOs are common – we even have a programme in place to classify and log and determine the speed of them and it goes into a vault.”

Marc made the claims at the Devil’s Tower UFO Rendezvous in Hulett, Wyoming – where UFO enthusiasts from around America met at the site of Close Encounters Of The Third Kind rock to discuss alien-related findings.