The Gold Timers confront gold thieves and a super-sensitive detector lands them on gold, and Shane and Russell's homemade sluice struggles to process pay before they gamble on overworked ground.

The Poseidon Crew race to find gold before freezing weather shuts them down and the Dust Devils gamble over $150,000 on a crushing plant as a new team hunt the vast state of Queensland.

New rookie Sehaj battles a back injury, abuse, and a time-critical delivery; meanwhile, 22-year-old Roy has the weight of the world on his shoulders carrying 48 tonnes of steel plates.

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.

Record cattle prices and a wet season have turned the outback into a gold mine for bull catchers; husband-and-wife team Liz and Willie Cook are expanding their empire, but with ever-increasing debt.

Myles and Timmy are at breaking point. Squizzy's risky gamble pays-off and Bryce rockets to the top of the tally-board.

Flood waters rip away a major highway crossing in California; experts use the latest tech to investigate and reveal bridge scouring with unsupported concrete columns exposed for failure.

Jeff recreates an historic flight in search of vital clues before an archive discovery drops a bombshell.

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.

Mike and Connor argue about restoring a 1967 Chevy II to original factory condition or as a high end 'resto-mod' with 21st-century touches, and a drag race brings out everyone's competitive spirit.

Big Al races to open up virgin ground, but his operation grinds to a halt when Hiro's Curse returns.

The Gypsies are on gold before thieves raid their nearby lease, the Scrappers' struggles go from bad to worse, and the Dirt Dogs urgently need the mill to keep running daily for the next three months.

The Victoria Diggers' million-dollar dream is at breaking point, the Dirt Dogs hunt down gold thieves, and the Mahoneys stumble across a mysterious murder.

Who'll claim the top spot on the season's tally board? It's Squizzy versus Bryce versus Myles. And it's anyone's game.

Paul and the SOS team take on a mining mystery as they try to find and fix the causes of a two-year dry streak that threatens to end the prospecting dreams of rookie miners Chris and Vince.

Big Al races to open up virgin ground, but his operation grinds to a halt when Hiro's Curse returns.

The Ferals hit a run of nuggets that could transform their season, the Gold Retrievers are rocked by a medical emergency, and Marcus, Linden and Dale try to salvage a disastrous season.

Ryan collapses in a heatwave before the Ferals uncover a massive haul of gold, the Poseidon Crew's site is swamped after a brutal storm, and Shane and Russell uncover the biggest nugget of the season.

Melanie Wood and Alex Stead's future hinges on a $400,000-dollar-dry blower, newcomers Sheryl Munro and Simon Lawes struggle to find new ground, and gold legend Shane Calegari helps an old friend.

Desperate to land a peak-price tuna, Adam hooks a leaping shark and an undersized fish instead. Meanwhile, Steven considers a multi-million-dollar licence that could change his future.

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.

Andrew and Jeff discover a hidden cave in search of clues and an unexpected find that injects the team with fresh hope.

The Old Timers have bought a new claim sight unseen, the Apprentices try to connect a mine shaft to their underground drive, and the Kids strike an agreement with their neighbour, but will it pay off?

On Vancouver Island, surfers, scientists, and a Tla-o-qui-aht carver brace for the Cascadia mega-quake - not if, but when.