The Kristjansons make a pilgrimage to their ancestral home of Iceland; Elena and Jamie have a hard first day when their snowmobile sinks, and Trevor is set on not taking unnecessary risks this season.

Mining legend Neville Perry returns to the legendary German Gully with unfinished business, and outback adventure team Salty and Alan head to the world's biggest monocline in search of gold.

A tragic injury forces Ethan West to step up and run the Poseidon Crew on his own, and Jacqui and Andrew face dangerous wildlife as they push deeper into the Palmer jungle than ever before.

Clayton's Towing navigate tidal pressures and bull sharks to salvage two yachts, and Parks Towing recover a sheep transportation truck that crashed through a railway crossing in heavy fog.

The Poseidon Crew battle to run two leases simultaneously in a bid to meet their 1000-ounce season target, and Alan and Salty brave uncharted waters and make a significant discovery.

Juanita goes missing at Cape Carnage and Bruce disembarks; Tiger decides to go to Karumba to unload as tides worsen, but his plan backfires and the Wildcard is forced into a U-turn.

In Poland, engineers battle unstable mountains, methane gas and treacherous terrain to build a new high-speed railway through the Carpathian foothills.

Tension is high in the outback. Sebastian must manage a risky balance between money worries and gold hunting. Meanwhile, Stanley and Kristin experience a disappointment with the metal detector.

Permit delays devastate the Poseidon Crew's hope of a massive payday, a torrential downpour forces Shane and Russell to evacuate their dig site, and the Ferals finally uncover a rich patch of gold.

As Jacqui and Andrew are targeted by potential gold thieves, Marcus, Linden and Dale hunt in ground close to the site of the biggest nugget ever found in Western Australia.

Rupert has decided that life is too short not to follow his dream of owning a Morris Traveller; will Rupert's 13,000-pound budget stretch to a good one?

Cam and his crew rush to start sluicing Donovan cut. Karl comes up with a clever way to motivate his crew. Chris and Nika's operation is halted by a sluice plant breakdown.

The Goldtimers gamble their last $6,000, Brad and Chris get expert advice that lands them some gold, and the Ferals face a killer snake.

The Poseidon Crew hunt a remote mountain pass, a gold drought puts huge pressure on Jacqui and Andrew, Levi and Bridget are left to hunt alone, and the Ferals hunt in the extreme Pilbara region.

As wildfires rage, Dale battles smoke, heat and steep mountain passes to help his friends... until the road fights back.

Ray must build a crucial piece of mining equipment, Erik and Christian head to a neighbouring claim where the promise of bigger gold is hard to resist, and Elley goes in search of other minerals.

Chris and Nika's rookie mine hand Nick get the dozer stuck in mud while opening up their biggest cut ever.

Intense heat pushes Jacqui and Andrew to their limits; high winds threaten the Desert Diggers' relocation plans; Shane and Rusty battle breakdowns and brutal conditions to keep their operation alive.

Brent tests the mining skills of his late friend Neville Perry's sons, a mechanical fault stalls the Wanderers' excavator, and the Mackies make a risky investment on new ground.

Irv finds the holy grail of VW: the Beetle. It's just miles from his garage, so he makes it his mission to breathe new life into this 75-year-old cable-break classic.

Tension is high in the outback. Sebastian must manage a risky balance between money worries and gold hunting. Meanwhile, Stanley and Kristin experience a disappointment with the metal detector.

From Junior Johnson's moonshine-fuelled rise in NASCAR to sophisticated smuggling tunnels, this episode delves into how criminal ingenuity has shaped illicit industries.

In Colorado, engineers battle drought, extreme weather and immense water pressure to raise a 70-year-old dam to record-breaking heights.

Michael and Cherie are determined to make the most of their surface claim while conditions are good, and Ray and Paul head underground in the hope of finding a green sapphire.