Arctic Thaw

As the final 72 hours of the Ice Road season tick away, legendary driver George Spears calls it a career, Lisa Kelly makes a harrowing 300-mile run with no brakes, the rivalry between Alex Debogorski and Hugh "The Polar Bear" Rowland comes down to the final load, and polar bears--real ones--shut down the Ice Road in front of Jack Jessee, as the "Dash for the Cash" comes down to the wire.