Science Channel HD

Directed energy weapons, once only seen in science fiction, are now reality. They can disable cities' circuits and destroy missiles, heralding space warfare.

The Yeti, a machine with 588 sharp teeth, helps keep an airport running; tugboats break the ice in an Alaskan port; soldiers stationed at the coldest army post in the US.

Alaska's Coast Guard fights dangerous waters to maintain buoys; machinery finds big rewards 800 feet below Alaska's surface; Alaskans build a steel ferry.

Spaceships powered by atomic bombs; artificial rings encircle an entire star; Neil Armstrong's transmission feed cuts off when he spots strange lights on the moon; how can lightning talk to itself.

Astronauts evacuate when a mystery object hurtles toward the ISS; a NASA secret agent goes undercover to retrieve missing moon rocks; scientists struggle to find answers when they discover a huge void at the edge of the solar system.

Two astronauts trapped in the vacuum of space face a horrible death; the first close up images of Pluto show an alien landscape; residents of Houston struggle to explain videos of unidentified flying lights captured above their city at night.

Neutron stars are strange and violent phenomena that defy the laws of physics, and new discoveries reveal that these bizarre nightmares are far more deadly than previously believed, with the power to destroy planets and even other stars.

Dark matter and dark energy are locked in an epic battle for control of the cosmos, and the winner will determine the fate of the universe; new discoveries might reveal which force will emerge victorious.

This decaying fortress once stood between the Ancient Roman and Persian Empires; though the stronghold's location attracted great wealth, it also attracted attention from unfriendly neighbors.

In modern-day Turkey, on the coast of the Aegean Sea, archaeologists discovered hilltop ruins that are believed to be the site of one of the world's most enduring stories -- the legend of Troy and the Trojan Horse.

In the Turkish capital, ambitious plans for a new amusement park are disrupted by financial, mechanical and political problems, forcing the park to close; now its old roller coasters stand as symbols of excess on the city skyline.

On a picturesque island off the coast of Brazil, this penal colony was once the site of a dramatic prisoner uprising; among the ruins lies the story of the violent rebellion and the recapturing of the island by military forces.

A teenage girl in Korea is martyred in prison and becomes a national hero; the facility where she was held stands in remembrance of her bravery and the Korean struggle for independence.

Formerly known as one of the toughest prisons in America, this massive complex was once home to medical experiments and a chaotic hostage situation; it's better remembered as the setting for the iconic opening scene of "The Blues Brothers.".

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground; experts discuss the critical role that the base played in defending America's coastline.

Adolph Hitler disappears from the world in an apparent suicide at the end of World War II, but theories of his possible escape continue to circulate; experts use forensic science to examine remains that could finally solve the mystery of his fate.

Brand-new evidence reveals the secrets of a Nazi program to build a nuclear bomb; using cutting-edge science and technology, experts uncover classified files that reveal how close Hitler came to this terrifying super weapon.

Using cutting-edge forensic analyses, some of the world's leading investigative experts uncover the stunning truth behind compelling mysteries from ancient times to the recent past.

Three inmates are said to have escaped from Alcatraz prison, but even today, it's never been proven; new evidence might finally crack this notorious cold case, as experts use forensic science and cutting-edge technology to investigate fresh leads.

A failed assassination unleashes claims of a mind-controlled gunman; Andrew investigates the CIA's legacy of MK-Ultra program, and stages an experiment with mentalist Max Major to test whether a person really can be hypnotized into becoming an assassin.

Beneath Yellowstone National Park is one of the world's largest active volcanoes, and it's poised to erupt at any moment; experts use seismic technology and visual imaging to reveal its catastrophic threat.

Three inmates are said to have escaped from Alcatraz prison, but even today, it's never been proven; new evidence might finally crack this notorious cold case, as experts use forensic science and cutting-edge technology to investigate fresh leads.