Isaac and Sofia -- the Opal Whisperers -- set out to prove themselves as miners. Jaymin and Noah explore a dangerous mine alone while the Blacklighters are hit with a crippling excavator breakdown.

Scott and the Bishop cause an avalanche while trying to secure a wall. The Mooka Boys' bobcat suffers a critical failure and the Blacklighters dig into a rich-and-dangerous abandoned mine.

The Young Guns hopes of breaking their drought are shattered after they accidentally smash a valuable gemstone. The Bishop loses Scotty underground and the Tarantos' hopes of exposing a rare opal pocket are at risk.

Mooka Boys brothers Matt and Cozza topple their excavator while attempting to reach a new mine on a treacherous opal field. Plus, 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 bankrupt Bushmen are forced to trade opal to drill a well on a new claim. The Mooka Boys attempt to revive a dump truck and its opal processing factory, with disastrous results. The Digi Diggers get lost exploring a terrible abandoned mine.