A sketch on what could be Walter Jackson's map to the gold sends the team back to the Pitt, where a recurring marker points to a new theory at the heart of the Slumach legend.

Rain hampers Robbie's efforts to truck a home to the Gold Coast, and Graham faces storms and grass fires moving a section of railway 5,000 kilometres in just five days.

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.

On the cusp of completing their biggest job of the year, Liz leads Team Cook through dust, mud, and barbed wire - meanwhile, Clarry is determined to make target for his Indigenous clients.

A 1969 Road Runner gives Mike a run for his money while his generosity gets out of hand, and shop dog Lincoln gets a special surprise.

The captains fight to stay ahead of the weather as Adam - who is stretched thin after weeks of running two fisheries - finally hits his crab quota but then runs into trouble in dangerous shoal waters.

In this episode, we investigate how the most incredible bridges from around the world help to solve a series of spanning problems.

Richie and Kimberley - the owners of 1870 - learn the hard way that all that glitters is not gold, and old business partners Donnie and Leigh come face-to-face in a dramatic screaming match.

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.

Tensions spill over as the Poseidon Crew face a series of breakdowns, the Ferals are kicked off gold-rich ground before a new lease turns up a major haul, and the Gold Timers get lost in the outback.

Racing against time, PJ and Andy start a night shift to sluice their best pay dirt of the season before winter shuts them down.

Irv is a world-renowned expert in VW Sambas, so when an American collector turns to him with a bunch of rusted panels, and the dream of a showroom quality vehicle, there's only one man for the job.

Kellie Carter and Henri Chassaing are hit by breakdowns and bandits, while a failed plan leaves the Gold Gypsies running out of time and options.

The Dirt Dogs take a do-or-die gamble to reach their tally as the final week of the gold season begins, while Kellie and Henri mount a last chance hunt for big nuggets.

Kevin faces disasters everywhere: his logging operation is shut down, his main client is threatening to walk, and he is about to lock horns with his right-hand man.

Six weeks into the mackerel season, the Wildcard crew faces incredible highs and lows; a record haul brings triumph, but injuries, tensions, sharks and a sinking rowboat could threaten it all.

Chris and Nika's best start ever may be blown by a good deal gone bad.

The Gold Devils race against the elements, Jacqui and Andrew push to new extremes, and mechanical issues leave the Ferals divided.

Alan and Salty hit a dead end in the remote Kimberley region, Vince, Bibi and Murray are forced to break new ground in Victoria, and the Gold Retrievers struggle with their misfiring wet plant.

On the Magdalen Islands, the snow crab and scallop opening days are hammered by a winter gale, slashed quotas, and gear failures that threaten to sink far more than just the start of the season.

Lilly and Luke are up against Claire and Beau in a three-day survival mission; dropped off naked, the teams must survive with nothing but basic supplies in order to reach the finish line.

Zenica prison is the biggest and toughest prison in Bosnia and Herzegovina; the 1886 fortress still stands to this day.

Christian digs down with a 38-tonne excavator to the blue clay layer that Ray hopes will be the key to the team finding a fortune, and Elley and Christian find the biggest piece of gold so far.

The Dust Devils' entire operation is forced to shut down as The Poseidon Crew's dig zone floods, forcing them to abandon their deep pit mining and defend their detecting patch from rival prospectors.

The Gold Gypsies make a discovery that could catapult their season, the Victoria Diggers hit red tape - pushing Neville to the edge - and the Goldtimers confront gold thieves.