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In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Tyrell Seavey, Dallas Seavey and Willi Prittie cross the Triumvirate Glacier in 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/National Geographic Channels, Stewart Volland)

In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Tyrell Seavey, Dallas Seavey and Willi Prittie cross the Triumvirate Glacier in 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/National Geographic Channels, Stewart Volland)