Science Channel HD

Drill down on maintenance and safety lapses that derailed amusement park rides.

When dams break, devastation follows; Derna, Malpasset, Brumadinho, three disasters that turned engineering failures into mass tragedies.

Bridge collapses have etched hard lessons into the history of engineering; Tacoma, Minneapolis, Genoa, symbols of innovation that have become stark reminders of what happens when flaws go unchecked.

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.

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.

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.

Sidecars; frozen French toast; refrigerator compressors; superchargers.

Custom knee braces; air conditioners; window films; motorcycle exhaust.

More everyday items are put under the microscope; discovering how solid state drives, eyeshadow, limousines and dead blow hammers are made.

More everyday items are put under the microscope; discovering how dragster tyres, icing, floating docks and spiral pipes are made.

Statue restoration; tripods; Polish sausage.

Champagne; ATMs; marine turbochargers.

Explore the ins and outs of the making of sharpening steels, bladder pumps, ironing boards and kayak paddles.

Learning how champagne hoods and foils, pneumatic delivery systems, espresso machines and pizza ovens are made.

Underwater robots; lasagna; band saws; ski trekking poles.

An insight into the making of laminated wood beams, off-road sport utility vehicles, veggie burgers and augers.

Discover how turbochargers, enchiladas and watches are made.

Patterned glass panels; road cases; stop-frame animation.

Subterranean military fortresses situated on the southern coast of Ireland have protected against enemy invasion for over 400 years, and now, experts investigate how this powerful stronghold transformed into a brutal and terrifying prison.

Buried nearly a mile beneath the Black Hills of South Dakota is a cutting-edge laboratory at the forefront of astonishing scientific research; experts reveal advancements engineers achieved more than a century ago that keep it operating today.

A decommissioned missile launch facility in Kansas remained one of the best kept subterranean military secrets of the Cold War; experts reveal how this abandoned underground complex transformed into a state-of-the-art survival bunker.

Hidden beneath the town of Ramsgate, England, lies a hidden network of over three miles of air raid tunnels; experts investigate and uncover an extensive WWII bomb shelter that became a permanent refuge for many civilians after a devastating attack.

A forgotten world of ancient underground passages and medieval engineering lies hidden beneath the town of Exeter, England; experts investigate and reveal how this ambitious tunnel system was the result of one of the deadliest epidemics in history.

Retracing the steps of freedom seekers escaping on the Underground Railroad, archaeologists use high tech to explore a Florida fort that was nearly erased from history.

Archaeologists unearth the lost community of Quindaro, Kan., a long-forgotten abolitionist town that shielded Freedom Seekers from bounty hunters; in Illinois, experts use tech tools to explore a secret underground tunnel.

Archaeologists uncover evidence of a Freedom Seeker community in the swampy marshlands between Virginia and North Carolina; in Maryland, experts investigate artifacts that may confirm the location of Harriet Tubman's childhood home.

Underwater archaeologists search for the wreck of the USS Planter, a Civil War vessel seized by Freedom Seekers to escape the Confederacy; in Canada, experts use tech to uncover how Freedom Seekers lived once they made it to their new homeland.

Archaeologists unearth the lost community of Quindaro, Kan., a long-forgotten abolitionist town that shielded Freedom Seekers from bounty hunters; in Illinois, experts use tech tools to explore a secret underground tunnel.