National Geographic Channel
Expert climber Willi Prittie leads Brent Sass and Tyler Johnson into the mountains. The bearing they're traveling reaches elevations over 4,000 feet.
Veteran mountain man Marty Raney is leading his son Matt and survival expert Austin Manelick through the river valley.
Brothers Dallas and Tyrell Seavey navigate along the ridgeline, crossing land with little cover. These born racers are resolute to be the first to arrive.