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Alaska's Coast Guard fights dangerous waters to maintain buoys; machinery finds big rewards 800 feet below Alaska's surface; Alaskans build a steel ferry.
Alaskan engineers build a massive dam to power an entire town; the world's largest helicopters; Alaska's largest boat lift hauls a 400-ton fishing ship in high winds.
A barge carries an entire train along Alaska's high seas; a flying ambulance saves lives at 14,000 feet; 16 missiles stand by to prevent a nuclear disaster.