Mooka Boys brothers Matt and Cozza topple their excavator while attempting to reach a new mine on a treacherous opal field; the Blacklighters are almost buried alive while mining opal in unstable tunnels.

A busted dirt hauling bogger bucket threatens the Cheals' ambitions for mammoth back-to-back opal hauls; the Opal Whisperers' partnership with veteran miner Uwe ends abruptly; Angel attempts her first opal sale at the Lightning Ridge Opal Festival.

The broke Bushmen are forced to trade opal to get a shaft drilled on a new claim; the Mooka Boys attempt to revive a dump truck and their opal processing plant with disastrous results; the Digi Diggers get lost exploring a terrifying abandoned mine.

The Digi Diggers get their solar plant installed, but the power-hungry mine triggers a total system shutdown; Lisa jeopardises a sale with a bespoke jeweller designer; Rod goes toe to toe with ratters who stole opal and equipment from their mine.

A vicious storm threatens to end the Misfits' season early; Issy attempts a new black-lighting technique to impress Opal Joe; the Digi Diggers' mine gets flooded, forcing the pair to scour the outback for a new claim.

The Blacklighters must work a new claim using an ancient opal processing plant. The Misfits discover they're losing precious opal, so they attempt a night dig.

The Bushmen's homemade hoist and bucket fail; Rod is forced to down tools with busted ribs; Sofia and Isaac from "The Opal Whisperers" get trapped at the bottom of their open cut mine in sweltering temperatures.

Isaac from the Opal Whisperers works an abandoned, dangerous mine and partners up with a veteran Yowah miner; the Mooka Boys are confronted by an irate miner as they peg a claim too close to his mine.

The Bushmen's drill rig loses a vital pin, forcing 74-year-old Les to undertake emergency repairs four meters in the air; the Digi Diggers flooded mine wall collapses as Josiah and Lisa attempt a new method of extracting Yowah nuts.

The Bushmen struggle to locate the source of water flooding their mine; the Misfits are forced to work Issy's mine, Honey Hole, as they wait for bulldozer repairs; the Blacklighters are forced to help a fellow miner on a dangerous night dig.

The Bushmen bust blower pipes and break diggers in their last chance to find opal this season. The team tackle two mines simultaneously and bring in a master opal cutter, hoping to transform rough stones into a $100,000 haul. The Misfits are flooded out of their open cut mine and return to Honey Hole with custom-made machinery; a giant chainsaw attached to a bobcat, desperate to turn a profit on the last dig of their season. Sofia and Isaac from the Opal Whisperers are threatened by a mine roof collapse as they struggle to extract opal from crumbling walls. Isaac attempts to make a profit by cutting and polishing their last opal find for the season, but risks destroying the stones in the process.

Sweltering temperatures and a waterlogged mine threaten to unravel The Digi Diggers' season-long dream; the Cheals' starter motor fails on their wash plant as they race to process the last opal dirt for the season.