The teams cross a steep ridge to the crumbling Strandline Canyon, then trek 40 miles to the landing zone. The Military Team's strategy is to charge straight down the glacial drainage basin. Before they know it, they're up to their knees in quicksand. The Mountaineers follow the same flatland strategy, and Marty and Tyler are soon stuck in the quicksand. Endurance Team heads straight for the canyon and hopes to follow the winding valley to the landing zone, but a furious river blocks their path.