Alaska Mega Machines

On the remote island of Sitka, Alaskan engineers construct a gargantuan dam to power the entire town. Ride shotgun on a dangerous mission on the world's largest helicopters. And, Alaska's biggest boat lift hauls a 400-ton fishing ship in high winds.

A rugged ship built to withstand tsunami size waves travels on a highway unlike any other in North America. Later, a fleet of machines combats a massive flood.

The Yeti, a machine with 588 sharp teeth, helps keep the coldest airport in America running. Plus, mighty tugboats chew through ice chunks in Alaska.

Alaska's Coast Guard fights risky waters to maintain buoys standing three stories tall. Plus, an army of Alaskans build a steel ferry - several tons at a time.

A mega fish factory churns out 3 million pounds of seafood a day. Plus, a flying ambulance saves lives at 14,000 feet above Alaska's wilderness.

Only in Alaska can you find an airport made from nothing but water and ice. And next to a field of moose, 16 missiles stand by to prevent a nuclear disaster.