Chris starts his season with a massive catch of Tullibee, but happiness is short-lived when all of his nets then freeze into the ice; meanwhile, Justin and Mike start in Hecla and hit the motherlode.

Justin and Chloe fly choppers to detect gold in the outback in Western Australia, and new team The Brumbies forms when Kat loses her office job and joins her prospecting partner Brett.

The Poseidon Crew are plagued with accidents and their aftermath in Victoria, and new team the Heli Hunters come face-to-face with the dangers of flying choppers.

Jessie from GRS Towing is transporting an 8-tonne river boat across three states, and the Cool brothers have a two-hour window to retrieve two electricity installation trucks.

A freak accident forces Jacqui and Andrew to call in help, Alan and Salty take a bold gamble for their final push of the season, and Shane and Kate dig up an explosive relic from the past.

The Wildcard crew pushes hard to hit their 35-tonne season break even target, and a return to Cape Carnage results in a season-ending injury.

In Colorado, engineers battle drought, extreme weather and immense water pressure to raise a 70-year-old dam to record-breaking heights.

Gordon is under massive time pressure. But a frustrated Sebastian stays away from work. Meanwhile, Stanley and Kristin fight their way to an abandoned mine, discovering promising signs of gold.

The Poseidon Crew finally start digging the legendary Catto's Paddock in search of a multi-million dollar nugget, and the Goldtimers struggle to keep a borrowed dry blower running.

A robbery at the Gold Retrievers' camp heaps more pressure on Brad and Chris' partnership, Marcus and Linden finally hit a rich patch of nuggets, and the Goldtimers call in reinforcements.

Eric loves open-top motoring, but his sports car is too low and he needs an automatic car; Sheldon and Peter therefore suggest a VW Golf Cabriolet that might stretch Eric's budget.

Chris and Nika butt heads while moving to a new cut. Cam struggles with machine failures and contaminated fuel. Ken and Guillaume's mining plans nearly go up in flames.

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.

Crane operators take advantage of the peak of the fishing season to launch a huge number of boats; this time of year is almost nightmarish for those in charge of keeping the shipping lanes clear.

It's tough running a sapphire mine, and the Mifsuds are learning that the hard way; Ray and Paul use their 40-tonne drilling rig to punch a hole down to meet up with some old tunnels.

Nika and Chris fight machine breakdowns and water problems, but a new crew member may turn their fortunes around.

Shane and Russell chase lost gold on Mosquito Creek armed with new information; disaster strikes the Desert Diggers; Jacqui and Andrew push deeper into the Palmer River using a new off-road vehicle.

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.

In France and Italy, engineers battle crushing rock pressure, unstable geology and extreme underground conditions to build the longest railway tunnel ever constructed beneath the Alps.

Gordon is under massive time pressure. But a frustrated Sebastian stays away from work. Meanwhile, Stanley and Kristin fight their way to an abandoned mine, discovering promising signs of gold.

Inside Clayton County Jail, an overcrowded, deteriorating facility, daily life is shaped by violence, contraband, and infestations that test every housing unit.

As wildfires rage, Dale battles smoke, heat and steep mountain passes to help his friends... until the road fights back.

Anthony and Jodie finally install the ladder in their unused shaft and Matt and Amber start digging underground on their new claim; will their investment pay off, or have they bought a dud?

Justin and Mike experience a violent ice-quake that leaves them rattled; after their best start ever, Justin and Mike's season goes wrong as two of their nets are swept away on the shifting ice.