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.

The world's only actual all-terrain vehicle is an Arctic mega monster that can conquer land, snow, and water in dangerous conditions; elsewhere in avalanche country, only one machine can climb deadly mountains and protect a major highway.

A helicopter made for extreme environments aids US Army rescue efforts.

See how tourists explore the far reaches of northern Canada and gain exclusive access to polar bears on custom-built rovers, and how the Twin Otter aircraft drops much needed supplies to isolated villages.

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

Experts use a cutting-edge, all-terrain engineering marvel to access a perilous job site covered in snow; special insider access reveals how this modern marvel helps get the job done.

A drone uses advanced technology to fly on search and rescue missions.