Cast & Crew
Contestants fight to survive in Alaska's frigid conditions in this reality-competition series.
Premiered: May 12, 2013
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Teams must choose between trekking over a mountain pass or maneuvering their boat through one of Alaska's most dangerous rivers as they race to reach an ocean inlet in the fourth leg of the competition.
Teams ride the Alaskan railway before continuing the race in a remote river valley.
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