The Blacklighters discover opalised sea creatures in an ancient seabed. The Cheals close in on their biggest opal haul ever, but all is not as it seems.

The Mooka Boys may lose a potential investor due to their little mining progress. Disaster strikes for the Opal Whisperers when Sofia's hoist fails.

Gale-force winds threaten the Digi Diggers' dreams of an eco-mine. The Bushmen discover dangerous old workings while clearing out their new mine.

The Opal Whispers are forced to leave behind a rich opal seam in a mine on the verge of collapse. The Cheals are cut off from their mine by crippling floods.

The Digi Diggers need to explore new ground after mining opal too brittle to sell. The Bushmen discover their new claim has been dug out by opal thieves.

The Opal Whisperers work underground together for the first time on a legendary claim. The Mooka Boys are forced to work Leif's late father's abandoned mine.

The Cheals take on their most dangerous dig ever. The Bushmen trial a rookie to operate their exploration drill, but it doesn't go as smoothly as they'd hoped.

The Bushmen bring in an explosives expert to blast through the toughest rock in Grawin. Plus, a brand-new team brings cutting edge technology to the opal fields.