David Muise teams with Adam for a new adventure in the search for Slumach's lost gold mine.

Eric gets his 60-metre super-quad wedged completely stuck on a roundabout, and 22-year-old Roy takes on his first-ever triple trailer job.

Marcus, Linden and Dale desperately need new ground, the Poseidon Crew's hope for a 1000-ounce nugget is slipping through their fingers, and Shane and Russell take the biggest gamble of the season.

Heavy rains in Victoria threaten to shut down the Poseidon Crew, Jacqui and Andrew struggle through 40°C heat in Queensland, and the Goldtimers negotiate a lucrative deal to sell their mining rights.

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.

Mike looks for redemption at a demolition derby that Avery enters a car of his own at, and Mike also restores a 1965 GMC van with an emotional past.

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.

Cities around the world rely on the railway to keep them moving every day; we take a closer look at the planet's metropolitan railways and explore how they help us solve urban problems.

Leigh outfoxes Donnie and Dennis and wins the rights to Matt and Damo's gold-rich land, and can Gold Coast socialites Richie and Kimberley get their new washplant to site without damaging it?

Jacqui and Andrew finally strike gold, the Poseidon Crew break ground on their colossal new lease, and Shane and Russell risk coming face to face with wild dogs that hunt the outback.

An undersized excavator forces Rob to consider quitting the Ferals, Marcus and Linden confront a rival prospector, and expert help pushes the Gold Timers closer to their dream.

Ken and Guillaume's equipment problems mean they are only sluicing half of what they should be, Karl must deal with machine design flaw, and Bernie moves his operation hoping his luck will change.

Irv restores a golden supercar, a 1970s Lamborghini Espada, for a client in the Middle East. Hidden structural damage and spiralling engine issues threaten the entire project.

As the gold season reaches the halfway mark, Rick Fishers teams up with old-timer 'Biggy' to explore a mysterious site outside of Laverton. Acting on a tip-off, his season's fate is in Biggy's hands.

As bushland miners the Dirt Dogs stumble onto what could be the find of a lifetime, Henri and Kellie battle brutal weather and each other. Meanwhile, the Gold Gypsies strike a deadly threat.

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.

Scientists track transient orcas off California, a tugboat hauls logs through BC narrows, and a diver finds a Giant Pacific Octopus.

Ed and Riley's hunting plans are interrupted when their new sluice plant needs a major overhaul.

The Gold Devils return to their Fair Lady lease in pursuit of their 1000-ounce target, and the Ferals face a standstill when their excavator is seized by rivals.

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.

As the historic 150th Magdalen Islands lobster season begins, Steven and a handful of other captains break the unwritten rules of the islands by border-hopping to northern waters.

In the Swiss Alps, engineers battle extreme heights, brutal weather and near-vertical terrain to build a record-breaking mountain cableway to the summit of Schilthorn.

Olivia takes a look at the world of sugar babies, young women dating older men for cash.

Kimberly and Tiffany get a rare chance to contact loved ones back home, Christian and Elley follow a hunch, and Ray and Erik embark on an adventure of a lifetime to a reindeer station.

The Poseidon Crew hit the jackpot after being forced to detect just to survive, the Goldtimers' rookie season goes from bad to worse, and the Dust Devils unearth a million-dollar reef.

Shane and Russell risk running out of water and crippling their operation, the Victoria Diggers are almost out of ground to dig, and the Gold Gypsies weigh up a life-changing decision.