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Pete Cooke and Sam Westra head out on the last dig of their season as Sam decides whether or not to stay in the business. Veteran prospector Col Duff scouts possible sites for a new mine.
A violent storm leaves The Young Guns racing to protect their claim from a flood. The McFarlanes try to build a drill from spare parts to dig below their mine's floor.
After an injury to one of their members, the Young Guns face a tough decision on how to continue mining. The Cheals break through to a long-lost underground mine.