Few have ever heard of the top-secret base in the deserts of Utah known as Area 52, but reports of UFOs have convinced people that the US military is keeping secrets.
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While on patrol in Chechnyan forest, a Russian infantryman sees mysterious lights and fights an unknown presence that has a hypnotising effect. An intrepid Air Force engineer learns about evidence of UFOs at Wright Patterson Air Force Base.
US Navy Boatswain Mate, Robert Young, witnesses a strange green fog in the Bermuda triangle and experiences a spiritual warning that saves his life. Tech Sergeant Octavia Madden discovers her base house is haunted by the spirit of a little girl.
When a mysterious predator eats a shark, experts wonder if a prehistoric monster is to blame a sinister sight is caught on tape near Russia's Area 51 and the evidence might point to a cover-up.
A giant creature in an armor of ice is spotted in the Alaskan wild, and some suspect it's a deadly mythical monster a jet has a close encounter with an unknown object evidence of a deadly lightning strike invites paranormal explanations.
For decades, extraterrestrial research has been directed to the skies - but researchers believe that UFOs may also be inhabiting our oceans.
Few have ever heard of the top-secret base in the deserts of Utah known as Area 52, but reports of UFOs have convinced people that the US military is keeping secrets.
Over the past 50 years a fascinating pattern has emerged, linking UFOs with military personnel and installations. One of the most significant of these events took place on British soil in 1980. This programme contains some flashing images.
When a great white shark is killed, experts suspect a mysterious ocean monster and strange markings in the desert might be a tribute to an ancient spider god.
When a massive spider's web takes over a park, experts investigate if this monster's trap could capture a human. A tree spurts out thick red blood, and some believe it could be an undiscovered species of carnivorous plant.
When a river of blood washes through a city's streets, some witnesses believe it's a warning of doomsday a strange, perfect circle emerges in the clouds about California, with some experts speculating that it's evidence of alien activity.
A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park.
This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths.
A stroll through Great Sand Dunes National Park, where strange lights, animal mutilations and other bizarre incidents have been spotted.
The infamous Yosemite National Park has a darker side that includes mysterious sightings, disappearances and even a prehistoric pterodactyl.
Physicist Enrico Fermi posited his famous paradox in the early 1950s, asking if intelligent life is so likely to occur in the vastness of the universe, then why hasn't any of it contacted the Earth?
If aliens have visited Earth, what are their intentions? Do they wish to experiment on the human body, or the human mind as well?
Those who claim to have been abducted by extraterrestrials give their accounts of the interior of their spacecrafts.
In this gripping episode, Craig and Sarah take on the Stephenville UFO case. They scrutinise all available evidence, talk to key eyewitnesses and grill experts before arriving at a final verdict. This programme contains some flashing images.
When a massive spider's web takes over a park, experts investigate if this monster's trap could capture a human. A tree spurts out thick red blood, and some believe it could be an undiscovered species of carnivorous plant.
Documentarian Seth Breedlove and his crew are joined by leading investigators on an adventure-filled week searching for Sasquatch in the Adirondacks of upstate New York.
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