Brand new team Digi Diggers bring brand new technology to the opal fields; Josiah and Lisa soon find themselves at breaking point.

The Cheals take on their most dangerous dig ever. The Bushmen trial a rookie miner, Ben, to operate their drill to find new opal bearing ground, but he falls short at the first challenge.

The Opal Whisperers work underground together for the first time on a claim where million-dollar opal Angel of Yowah was discovered decades earlier. The Mooka Boys are forced to work Leif's late father's abandoned mine.

The Digi Diggers, Josiah and Lisa, need to explore new ground after mining opal too brittle to sell; they discover their entire claim is at risk of being flooded.

The Opal Whisperers 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.

Gale-force winds threaten the Digi Diggers' dreams of an eco-mine; the Bushmen discover dangerous old workings while clearing out their new mine; Angel and Joe's search to join the Misfits threatens to tear the team apart.

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

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.

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