The mining season is almost over, to reach their target Col's crew take one last gamble opal spotting from the air.

With the end of the season fast approaching, the Rookies risk cave-ins at their abandoned mine claim. Deep underground, Bomb King George is trapped in the blast zone.

Desperate to move more rock, the Rookies get a lesson in the dangerous art of bomb-making.

It's brother vs. brother as Peter and Mick Cooke go head to head in an epic scrapheap challenge to build a monster opal hunting machine.

Daniel returns to Coober Pedy a new Dad, determined to find more white opal. Col raises the stakes, forking out thousands on an ancient and dangerous exploration rig, while the Opal Queen and her Dad, battle the clock, the weather and a deadly cactus.

Mick Cooke's mining operation grinds to a halt when the conveyor belt rips on a vital piece of machinery. In a desperate need for cash, Mick heads out of town on another job.

Rookie miners Justin and Daniel tread a dangerous path deep underground in an abandoned mine. Meanwhile, Kelly and Al search for a rare, valuable black opal.

In South Australia, rookie miners Daniel Becker and Justin Lang leave their lives behind, risking all to chase an opal fortune.