Four US Air Force reservists are chased by strange lights while flying back to their Cleveland base. Plus, a police officer loses consciousness while investigating a curious disruption in West Yorkshire.
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Residents of a Texas town report strange lights in the night sky. Scientists record one of the loudest sounds in the natural world.
A high-rise window washer somehow survives a 50-storey fall and basketball-sized ice chunks fall from the sky.
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.
A look at dolphin rescues, death-smelling pets and a skinny teen with unbelievable strength.
Did San Francisco's sea lions sense an impending disaster, what are the secrets of a mysterious medieval manuscript, and why do mummies in Egypt contain cocaine from Peru?
In New Hampshire, a hitchhiker observes a pattern of lights in the sky and is terrified when they seem to dive-bomb him. Plus, a sighting in Trans En Provence, France becomes one of the most investigated cases in UFO history.
Four US Air Force reservists are chased by strange lights while flying back to their Cleveland base. Plus, a police officer loses consciousness while investigating a curious disruption in West Yorkshire.
Discover images of an Iceland cave that could hold alien secrets, military structures in the Utah desert and a bloody stain in the sands of Saudi Arabia.
An abandoned military radar station in the Arctic looks like an apocalyptic nightmare. Full beer bottles line the bar, eggs in the refrigerator, magazines open on tables. What happened to the officers?
A secret underground military research station in the middle of the Greenland Ice Sheet is revealed as one of the most elaborate cover stories in the history of the Cold War.
For decades, there have been rumours key members of Hitler's inner circle escaped the fall of Berlin - maybe even the Fuhrer himself. But where did they go and what is their plan?
Evidence suggests that time travel may have occurred in the past.
In Belize, researchers find a curious skeleton in a cave. An ancient city in Cambodia is revealed by a LiDar scan. In Australia's far north, an old coin is unearthed on an island. Bolivian farmers discover something unusual hidden under the canopy.
In Guatemala, an old site made up of a series of strange structures is found. On a remote island, a lake full of jellyfish is studied. Argentinian researchers find a complex that may have a dark past. A flower found in Sumatra gives off a foul scent.
Uncover the shocking truth about alien remains as experts investigate unsettling reports of extraterrestrial bodies recovered from crashed UFOs.
Could alien technology have helped the Nazis' rise to power? Experts question whether Hitler had extraterrestrial help in his quest for world domination.
A mysterious opening caught on camera on the Red Planet – could this be a gateway to a base on Mars? A UFO appears to invade an Amazon village and leaves a trail of victims – and an unidentified craft gate-crashes the Queen's Jubilee celebration.
The infamous Yosemite National Park has a darker side that includes mysterious sightings, disappearances and even a prehistoric pterodactyl.
Built by the ancient Anasazi, spooky sightings in this national park include shape-shifting creatures and time-traveling Wingmakers.
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