The Bushmen's super digger is damaged; Pete and Sam hunt for better opal dirt.
The Cheal's machinery is too big for the mine; the Blacklighters take a gamble on a new claim.
The Bushmen's new claim turns dangerous; Pete and Sam's vision takes shape.
The Blacklighters' claim runs dry; the Young Guns have big machines but they're running out of safe ground.
The Boulder Boys try to reach a suspected 20-meter-deep opal level by draining floodwater; Rod Manning uses his wife's opal ring as collateral.
The Young Guns spend all of their savings on a hydraulic digger that only causes problems; the Blacklights run out of opal.
Pete and Sam begin a risky project that could pay off big time with opal riches; the Bushmen's new equipment doesn't deliver.
In outback NSW, the worst storm in 20 years devastates the Bushmen's and Chris Cheal's mine, while in Coober Pedy, a new team the Blacklighters need opal to re-establish.