Extreme Ice Machines

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

The US Army use a helicopter made for extreme environments during rescue efforts in some of the harshest conditions; a trio of small but capable tugboats move cargo vessels through the busiest port of Alaska.

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

The Yeti, a custom-made snow-eater, 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.