Trucker Hugh Rowland takes on an old donkey trail with some dynamite during his nearly impossible climb into the Andes. The trucking team of Lisa Kelly and G.W. Boles drive head-first into "Dead Nun Canyon," praying their truck isn't too big for the miles and miles of hand-carved tunnels in front of them. Tim Zickuhr and Tino Rodriguez aim to take on the canyons as well... if their mishaps don't stop them cold again.