National Geographic Society

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Vice Grip

Dead set on winning this leg, the Military strategy is to charge down the glacial drainage basin.  But just as they hit their stride, the encounter quicksand in the basin. The team's taking a chance and betting that running will put less pressure on the soft ground.

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The teams cross a steep ridge to the crumbling Strandline Canyon, then trek 40 miles to the landing zone, battling quicksand and furious rivers along the way.