Back where their gold-mining adventures began, `Gold Rush' alumni Dakota Fred and son Justin persevere in the face of long odds, risking their lives for a fortune they may never realize. Assisted by a team of intrepid divers, mountaineers and bush mechanics, the Dakota Boys explore the white water rapids of McKinley Creek in Alaska, diving deep in raging torrents with a suction dredge. Not only could one wrong move prove deadly, but the guys also face wild animals, extreme temperatures and hypothermia.