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On the final leg, the teams face their toughest challenge yet — a race across an icy glacier, down a whitewater river and across the open ocean to the Mount Augustine volcano. The trek begins high atop the Aleutian Mountains, where the competitors ha... (more)rness up and charge across a crevasse-laden glacier. With all three teams facing daunting obstacles, it's anyone's game going into next week's exciting conclusion.