It's 1975 at Loring Air Force Base, the largest strategic Air Force base in America - and a repository for nuclear weapons. Military officers at the base witness something unexplained.

A farmer out for a regular drive in broad daylight sees something completely out of the ordinary: a 30-foot-wide flying saucer.

On a sales trip in rural Australia, one man witnesses a strange light in a field. His car spins out of control, which is when things get even stranger.

A strange, flying object is outside an East Germany apartment complex... and then the light moves to the window.

When a police officer investigates an explosion in the desert, he sees what appears to be two small men in black. Can he trust his eyes?

An Australian ranch hand races to protect his herd from a nearby object that is hovering directly over his water tower.

A biochemist watches a mysterious craft land in his yard, presenting an opportunity to scientifically examine the unexpected item.

In Danbury, Conn., a crowd observes a triangular craft in the air. It was part of a wave of sightings in the Hudson Valley, where more than 5000 similar events were reported between 1983 and 1986.

These are the stories that have captivated experts and researchers' imaginations. These are the Close Encounters

This sneak peek of Science Channel's new series, starts with Malaysian Airlines Flight 370 which disappeared without a trace in March, 2014.

Modern aircraft are tracked by multiple systems in flight. Transponders connect with radar, and ACARS transmits signals between ground stations and satellites. In MH370, both were turned off; experts believe a person had to do it.

A hacker who worked his way into critical routing, fuel and other avionics over 20 times via in-flight entertainment, believes a smart hijacker could have used the same tactic to re-route Flight MH370 to a top secret location.

Flight MH370 vanished without a trace but with plenty of theories. One is the strong possibility a cargo of lithium-ion batteries, known to spontaneously combust and burn at high temperatures, could have brought the plane down.

60 years ago, scientists discovered evidence of an eruption 3,000 years ago that wiped out an entire city? Could this be evidence of Atlantis?

Two Atlantis hunters use a computer program that analyzes the 51 clues provided by Plato's writing to objectively target a location for the that vanished in a day.

Something spooked nine experienced hikers out of their tent on snowy night to their deaths. Missing clothes, shoes and some bodies horribly disfigured, an expert with their last writings finds nothing pointing to trouble.