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.

On the island of Sitka, Alaskan engineers construct a colossal dam to power the entire town. Plus, Alaska's biggest boat lift hauls a 400-ton fishing ship.

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. Next to a field of moose, 16 missiles stand by to prevent a nuclear disaster.