Six teams travel across Australia's unique and vast locations to find the country's most exclusive and iconic gemstones, especially the opal.
The Bishop hires a bomb expert to blast the impenetrable rock that's blocking access to a rich opal seam. Meanwhile, the Misfits face avalanches and dust storms.
The Mooka Boys risk being buried alive as they hunt for a legendary mine shaft. The Blacklighters are overwhelmed by choking dust on their bone-dry claim.
Scotty gets lost while exploring hidden tunnels on the Bishop's massive claim. Jack and Mickey are nearly crushed as the Tarantos try to move their machinery. S5, Ep12
The Bushmen attempt drilling for the first time with a 50-year-old exploration rig. Plus, the Mooka Boys go on a treasure hunt in a scorpion-riddled mine. S5, Ep13
The Young Guns rethink their black opal hunt when they face impenetrable mine walls. The Blacklighters' ambitious plan is threatened as their generator dies.
As the Bushmen search for a partner, their new rookie ignores safety protocols and rushes into a deadly no-go zone. Plus, the Cheals attempt to revive their season. S5, Ep9
The Bushmen take over their new recruit's mine, but the new claim proves equally treacherous with little sign of opal. Bishop resorts to explosives to move a wall. S5, Ep16
The Bishop and Scotty struggle to make safe a wall and end up causing an avalanche. Meanwhile, the Mooka Boys' bobcat is hit with critical failure. S5, Ep17
The Bishop loses his partner Scotty deep underground. The Tarantos' hopes of exposing a rare pocket of opal are in jeopardy and Young Guns make a big mistake.