In one episode, Dwayne Fields braves the mountains of Kyrgyzstan, where temperatures plunge to -40°C. Photo: Harry Palmer / National Geographic
In one episode, Dwayne Fields braves the mountains of Kyrgyzstan, where temperatures plunge to -40°C. Photo: Harry Palmer / National Geographic

7 Toughest Days: Dwayne Fields's extreme survival stories in 'relentless' environments