Ultimate Survival Alaska - Season 1 - Eps 2: River of No Return
The men are divided into two groups, building competing rafts. Mountain man Marty Raney is taking charge, building a colossal raft weighing nearly 2 tons which he hopes will be sturdy enough in the rapids. After spending five hours on construction, the five-man crew get on their way, but hunger starts to take its toll. Dallas Seavey, his brother Tyrell and survival expert Austin Manelick are meticulously engineering a smaller raft that's speedy and maneuverable to tackle the turbulent Yukon.
About Ultimate Survival Alaska

Title: Ultimate Survival Alaska
First Air Date: 2013-05-12
Last Air Date: 2015-03-22
Status: Returning Series
Rating: 8.2/10 (from 4 votes)
Language: EN
Seasons: 4
Total Episodes: 38
Network: National Geographic
Genres: Reality, Documentary
Production Companies: Brian Catalina Entertainment
Synopsis
They are some of the toughest, most extreme survivalists from across the nation. In the second season of Ultimate Survival Alaska, four teams - woodsmen, mountaineers, military veterans, and endurance athletes go head-to-head in an epic arctic competition that only National Geographic could inspire.