Marty sizes up the Alatna River to see if the current is too cold and strong.
(02:59)One group of explorers comes downhill only to find their journey just got tougher.
(01:14)The trip on the Yukon nears an end, and the teams gear up for the last leg - the rapids.
(01:48)Marty and Willi try and hunt some meat for the group, but can Willi’s gun shoot true?
(02:18)Marty and Matt are trapped on the wrong side of the river and time runs short to get to the LZ.
(01:07)The Seavey brothers push their way through bear country brush on the way to the LZ.
(01:52)Willi and the Seavey Brothers come to a crevasse that will test their will.
(02:13)Fresh snowfall on Day 2 keeps Tyler and Austin on edge.
(02:04)Marty and his inexperience take on river currents with deadly consequences.
(02:27)Tyler Johnson is a civil engineer who spends his free time pushing himself to the limit in the wilderness.
(01:19)Fisherman Tyrell Seavey comes from a family of legendary Alaskan adventurers.
(01:16)Survivalist Austin Manelick is willing to scavenge to avoid going hungry in the wilderness.
(01:19)