In this 2012 photo released by National Geographic Channels and Brian Catalina 

In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Dallas Seavey, right, sits with his brother Tyrell Seavey at a campsite in Arrigetch Peaks, Alaska. Dallas Seavey, who became the youngest Iditarod champion ever when he won the race in 2012, is among eight mushers or outdoor adventurers featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/Brian Catalina Entertainment, Brian Skope)
Associated Press
In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Dallas Seavey, right, sits with his brother Tyrell Seavey at a campsite in Arrigetch Peaks, Alaska. Dallas Seavey, who became the youngest Iditarod champion ever when he won the race in 2012, is among eight mushers or outdoor adventurers featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/Brian Catalina Entertainment, Brian Skope)
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