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Old partners Aaron Grotjahn and Col Duff reunite on a prospecting mission. The Tunnel Rats race to protect their claim as rival miners close in.
The Tunnel Rats blast their way to a fortune. Solo prospector Col Duff is stranded deep in the Queensland outback. Rookie Sam runs out of air underground.
The Bushmen risk their lives in the fight to get their one-tonne digger down a 20-metre deep mine shaft. Plus, new alliances are forged as the Boulder Boys hit pay dirt.