The temperature drops as the fishing crews continue targeting the most valuable fish possible. But as the lake ice locks into place, it presents a whole new set of challenges.

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.

North Coast Heavy Towing upright a chicken-filled B-Double, Clayton's Towing race to clear a catamaran from a pristine island beach, and Wagga Truck Towing have to clear a damaged silo away.

The Ferals are on the gold when a four-wheeler crash leaves them a man down, and the Poseidon Crew battle to overcome a catastrophic mechanical failure.

Steven returns to his off-island home and sparks questions about the future of the island community and who is left to carry it on.

Snow, ice, and a deadly mountain road push Dale to the edge as he fights to stay in control and keep his business moving forward.

The season is nearly over and all the teams are racing to hit their $500,000 gold targets; Damo and Matt are the goldfield's frontrunners, but they're being plagued by 11th-hour machinery breakdowns.

New 'hired hands' team The Ferals battle intense 40°C temperatures, The Poseidon Crew use old clues to uncover a bumper payday, and the Dust Devils launch their biggest and riskiest project ever.

Desperate to salvage the second week of their season as Shane and Russell return to the outback, the Poseidon crew fire up their million-dollar washplant, hunting their highest season target ever.

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.

Snow on Moose Creek makes for dangerous conditions and critical mistakes, Karl faces simultaneous breakdowns causing a shutdown, and Bernie's pay streak suddenly ends just as he loses a crew member.

The Poseidon Crew receive permits to mine their own ground and hit the motherlode, and the Goldtimers are pushed to their limits as Marcus and Linden return home and finally break their gold drought.

Gold thieves steal a fortune in gold from the Dust Devils, Shane and Russell hunt under an old caravan, and Marcus and Linden's lucky streak continues.

A simple scrapyard trip becomes a winter nightmare as Dale and Gripp battle snow, ruts, and wrecked gear on a remote mountain road.

Ray and Elley face a gruelling trek to a neighboring claim site; when Erik, Kimberley and Tiffany rebel after their attempt to set the sluice up is an epic fail, Erik challenges Ray's leadership.

Snow on Moose Creek makes for dangerous conditions and critical mistakes, Karl faces simultaneous breakdowns causing a shutdown, and Bernie's pay streak suddenly ends just as he loses a crew member.

Jacqui and Andrew blaze a trail into a corner of Fish Creek but a washout threatens to stop their 40-tonne bulldozer in its tracks, and the Gold Devils roll the dice on a costly move to new ground.

The Heli Hunters are forced to make an emergency landing in remote country in Western Australia, and Nev leads the Poseidon Crew to a secret patch in big nugget country in Victoria.

Irv imports an original-run short wheelbase Porsche 911 from the East coast of America. He needs to make it roadworthy while keeping its incredible sun-faded patina.

The gold rush season in the outback is in full swing. Gordon is unable to work after a dangerous tick bite on his head. Sebastian has to master complex tasks independently for the first time.

Reza sets off on a quest to be the first to capture the mysterious dugongs of Bahrain on camera.

In Greece, engineers battle earthquakes, unstable ground and coastal winds to build the country's first true skyscraper on the shores of the Mediterranean.

Todd and Brianna battle back-breaking work, gear failure, heat and dust; how will they juggle family life and grow their tiny sapphire business?