UFO hunters in Hertfordshire may have "summoned" a spacecraft as part of a new Amazon Prime documentary on aliens.

UFO Encounters of the Fifth Kind, a documentary by award-winning filmmaker Mark Christopher Lee, investigates the so-called CE5 protocols developed by UFO experts to supposedly allow people to contact and summon extra terrestrials.

Mark heard about this and, alongside fellow enthusiasts, headed to Woodcock Hill, near Sandridge, in an attempt to summon a UFO - which he believes they did.

"It was an interesting evening and obviously we saw a lot of planes and stars being a clear night, but we got to relax and hang out and talk UFOs with friends," he said.

Watford Observer: UFO hunters gathered at Woodcock Hill in Hertfordshire for the film.UFO hunters gathered at Woodcock Hill in Hertfordshire for the film. (Image: Nub TV)

"But weirdly as soon as we finished filming for the evening and started putting the cameras away someone spotted something high up that wasn't a star or a plane.

"Luckily we managed to get filming again and caught it on camera. It was definitely a UFO."

The film also encountered several unexplained setbacks, including co-producer Guy Thompson being unable to attend the filming due to a combination of illness, a broken down car and trains being cancelled.

"It was weird as I was all set to come up from Salisbury where I live to film in Hertfordshire, and I came over with this unsettling sensation and nausea," Guy said.

Watford Observer: The film crew experienced weird goings-on during production.The film crew experienced weird goings-on during production. (Image: Nub TV)

"I decided to push through it and got into my car, which had recently been serviced, but it wouldn't start.

"This increased my anxiety but I really wanted to get there, so I decided to take the train but once I got to the station all trains to London were cancelled. 

"I definitely think weird forces were at work."

UFO Encounters Of The Fifth Kind is out on Amazon Prime now.