Science Channel HD

A close encounter with an enraged ape-like creature is caught on camera, experts investigate if it's evidence of a once-extinct Neanderthal specimen engineered by a nearby experimental research facility.

Security guards patrolling the basement of an empty municipal building are shocked when they encounter a door repeatedly opening and violently slamming shut; experts investigate a connection to black magic rituals and the building's disturbing past.

A bizarre explosion is captured that morphs into a sinister black ring of smoke above a California football stadium; experts investigate and uncover an underground network of Satanists with connections to a string of modern-day terrorist plots.

An intelligence analyst on a secret mission makes an unearthly discovery.

A Russian Infantryman fights an unknown presence in a Chechen forest.

Counting down the top 20 internet legends; the smartest, brightest and bravest people who use their science know-how to thrill; how to light matches with bullets, walk the world's longest highline, and kayak in the snow.

Neil Armstrong enters an unexplained spin; an Apollo 17 photo seems to show a US military outpost on the Moon; possible alien life swimming in the oceans of Jupiter's moons.

When a former Area 51 insider alleges that the Roswell UFO incident was a nefarious Soviet conspiracy masterminded by Stalin, experts investigate if it was indeed an enemy plot against America -- or if the confession is just another cover-up.

Determining the age of the universe continues to be an elusive endeavor for scientists as their results are conflicting, and without a definitive answer, everything that's known about the cosmos could be completely wrong.

Mars is infested with robots, orbiting the planet and roaming the Martian surface on a mission to uncover its secrets; now, Perseverance joins this dedicated group of machines to uncover if there is, or was ever, life on the Red Planet.

A special drone uses cutting-edge technology to fly deep into treacherous, hard-to-reach mountains on dangerous search and rescue missions, and a hi-tech ice machine works tirelessly at a Toronto airport to keep flights running in brutal conditions.

The world's only actual all-terrain vehicle is an arctic mega monster that can conquer land, snow and water; a machine that can climb mountains.

Military search and rescue efforts in deadly arctic conditions rely on a specialized helicopter with unrivaled power and endurance, and special access reveals how it works; in the Alps, a monster snow blower keeps trains running in dangerous weather.

Experts use a cutting-edge, all-terrain engineering marvel to access a perilous job site covered in snow.

A helicopter made for extreme environments aids US Army rescue efforts in some of the most harsh conditions; a trio of small but capable tugboats moves cargo vessels through the busiest port of Alaska.

The Yeti is a custom-made snow-eater that keeps a critical Alaskan airport open for business; experts reveal how cutting-edge engineering and the latest technology keep this machine running in the toughest conditions.

When melting ice threatens to flood a town, a 22-ton amphibious mega machine battles the elements to save the day; in the Arctic, the Canadian Air Force relies on a massive transport aircraft to deliver supplies and personnel to far-off places.

A deadly tragedy on a freeway in Oklahoma sends one of the state's busiest bridges collapsing into the Arkansas River below; expert engineers investigate how a tugboat striking a reinforced concrete pier could cause such a catastrophic disaster.

Catastrophe strikes as one of America's most vital freeway intersections erupts in flames and completely collapses in San Francisco; experts use the latest science to investigate how an overturned tanker truck spawned a devastating inferno.

Construction turns catastrophic in New Orleans when the side of a hotel complex collapses on a busy street below; expert engineers investigate to uncover the reason behind this sudden and fatal disaster.

Atlanta's Mercedes-Benz Stadium, the world's most advanced stadium, features the most complex retractable roof ever built; the team races to finish the $1.6 billion arena for the NFL season.

A shipping catastrophe occurs when a massive container vessel runs aground and completely blocks one of the most vital trade routes on the planet; experts investigate and uncover critical wind conditions and potential navigational errors.

A vital hillside highway in Pennsylvania is destroyed in just minutes after a catastrophic landslide rocks a community; engineers investigate and uncover undetected geological issues with an increased and unstable traffic load.

Atlanta's Mercedes-Benz Stadium, the world's most advanced stadium, features the most complex retractable roof ever built; the team races to finish the $1.6 billion arena for the NFL season.