Watch Alien Files: Reopened

Former Navy fighter pilot Lt Ryan Graves and pilots in his squadron detected and engaged with UFOs on multiple occasions. He said that multiple pilots repeatedly witnessed a strange UFO phenomenon on their equipment, as well as with their own eyes, starting in late 2013.

An event from September 1994, when 62 pupils at the Ariel School in rural Zimbabwe said that they had seen silver craft descend from the sky and land on a field near their school. This was corroborated by numerous other sightings of an orange glow by adult witnesses who said a craft moving across the sky and emitting an orange glow, unlike any normal aircraft.

Silent, hovering triangular objects were seen by thousands of people and investigated by scientists and government officials, yet they could never be explained.

Around 3:00 am on 26 December 1980, a security patrol near RAF Woodbridge spotted descending lights. Serviceman Jim Penniston documented the craft for 45 minutes in a notebook.

Electrical physicist Paul Bennewitz was convinced he had located a top secret human and alien underground lab in Dulce, New Mexico near Los Alamos. The US military thought Bennewitz has come too close to top secret information and sent Air Force Investigators, including Sgt Richard Doty, to feed him disinformation.

In 1975, Swiss national Billy Meier claimed he had travelled on a beamship through space with extraterrestrial friends. He stated he had been in contact with these extraterrestrials telepathically since the age of five and that they allowed him to take photographs and videos of their spacecraft.

An alien race claimed to have been encountered by a military man stationed at Nellis Air Force base in the Nevada desert. Charles James Hall refers to them as the 'Tall Whites'.

In 1952, the radar at Andrews Airforce base and Washington National Airport picked up UFOs and two US Air Force F-94 jets streaked over Washington, searching for flying saucers. A week later, it happened again - more UFOs on the radar screen, more jets scrambled over Washington.