It's the end of the mining season and the last chance for all the opal hunting teams to make enough cash to survive. The Rookies gamble their hopes on one last haul of opal. The Opal Queen makes a final desperate dig.

Rookie Justin tackles a deal that could make or break him. The Boulder Boys race to save their claim from a monsoon flood. And on their last dig of the season The Cooke Brothers finally hit pay dirt.

The Fire Crew's season rests on a knife-edge as they struggle to battle their way back from a disastrous setback. The Opal Queen battles rock hard walls alone, desperate to find opal. And the Boulder Boys abandon their drill and hunt for opal by hand

The Rookies Justin and Becky risk their lives underground, desperate for a find. Meanwhile Opal hunting legend Col Duff is back, to take on the Outback, hunting long forgotten treasure.

The Rookies battle busted hoses and finally hit treasure, Boulder Boys Aaron and Greg bring in an old monster about to self-destruct, and at their wash plant, the Cooke Brothers race to beat the worst drought in a decade.

Justin recruits fiancée Becky to save him from financial ruin. The Fire Crew faces deadly reptiles and a snapped suspension in search blue fire opal. The Cooke Brothers go 21 meters under, desperate to get their hands on the first opal of the season.

Rookie Justin ropes in a stranger in a mad dash to get his excavator across a busy highway. Opal Queen Kelly battles a new claim with a new partner and with Col struck down with illness Aaron and Greg must push on at Dragonfly without him.

It's last chance for The Rookies' partnership, Col's crew are on a crash course as his recurring illness slows them down, while the Cooke Brothers fight busted hoses and breakdowns in the quest to strike it rich.

The Rookies battle their biggest claim yet, and each other; Col's Crew must bring out the old machines to hunt a new opal seam; and it's heating up as the Fire Crew race a fuel leak, chasing legendary red fire opal.

Rookie Justin gambles thousands of dollars on buying his way out of trouble; Opal Queen Kelly needs a big find underground or risk going broke; and Aaron and Greg's Dragonfly claim might finally pay off.

For the Rookies, there's tension as a new partner leads them on a wild goose chase underground. The Cooke Brothers' season is off to a bad start and Col's Crew is called on an emergency repair, wrestling a one-ton tire change.

Rookie Justin has cracks in his equipment and his relationships; Col's Crew are a man down and on their last drum of fuel; and in the wild west, new team the Fire Crew are on a wild goose chase hunting a bounty of fabled fire opal.

A new season opal hunting begins! The Rookies face potential disaster from the get go; for Col's Crew, their mining quest is derailed by a serious illness, and the Opal Queen brings in new muscle and new machines for an underground opal hunt.