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

Nick and Jo continue their battle to rescue a WWII bomber from a bush grave in western Australia, and Kelly must transport 40 tonnes of grapes to a winery before they start fermenting.

The Goldtimers catch a gold thief, Levi and Bridget make a rookie mistake that could end in disaster, and the Poseidon Crew take a desperate gamble on gold ground they've already detected.

The Ferals confront a gold thief, Jacqui and Andrew get their big break as professional lease explorers, and the Gold Retrievers head offroad to explore a promising new lease.

New recruit Sherl hopes to restore faith with his bosses on Team Cook, and Clarry's Indigenous clients dream of building a new life on their ancestral lands using proceeds from caught bulls.

Mike takes on a 1967 Cougar with a tragic past, the boys battle it out at a swap meet, and the completion of the Model T gets Avery thinking.

Lobster season explodes to life with no quotas and no second chances, William pays the price for being unprepared, and Adam and Steven scramble to finish their crab quotas.

We explore the wilderness railways that have pushed the frontiers of human endeavour into previously unknown territories and solved a set of complex problems along the way.

Donnie begs owner Dennis for a job At Swiss Diggings, and the glamorous Kimberley gets a tour of the 1870 mine's facilities and nearly throws up in disgust at the living conditions.

The final week of the season sees the Gold Gypsies plagued by more bad luck and the Victoria Diggers face a death in the family - can the Poseidon Crew's optimism help them reach their targets?

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.

PJ and Andy scramble to produce big gold after their main investor gives them an ultimatum.

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 Dirt Dogs' comeback rests on a crucial make-or-break action. Chris and Greg surf a wave of reef gold, and Henri and Kellie risk life and limb to continue working a rich vein.

Kellie Carter and Henri Chassaing are under attack from poachers and a crippling dry streak. Meanwhile, the Dirt Dogs are forced to break new ground to stay in business.

On a muddy recovery job, Dale proves that size doesn't matter when it comes to getting the job done.

With hundreds of boats on the North Atlantic, marine police are called into action and a rookie skipper finally gets his redemption tale.

A look back at some of the most memorable moments from the fourth season, as the miners deal with harsh conditions, mechanical failures and fierce competition.

Shane uses a clever bush fix to get himself out of a jam in the remote outback, and the Gold Retrievers find a gold-rich quartz vein that could hold the motherlode.

The Poseidon Crew battle challenging terrain in the mountains of High Country Victoria, and promising signs could lead the Gold Devils to a million-dollar pay day.

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 Poseidon Crew and Neville Perry's sons make their long-awaited return to German Gully, the Desert Diggers wade through mud for a payday, and Sheryl and Simon battle breakdowns to hit their target.

With more aircraft in the sky than ever before, pressure on pilots has never been higher as they need to get us safely where we want to go but when we want to get there.

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.

As hurricane season hits Newfoundland, a skipper races to salvage his cod season and a crane trainee is put to the test.