Chris continues pushing his crews hard as he ventures further onto uncharted ice - meanwhile, Mike and Justin continue to toil with their Bombardier as costs are up and fishing is down.

The Poseidon Crew are forced back onto an old lease in flooded Victoria, Shane and Kate call in help in Western Australia, and Jacqui and Andrew get separated at night in far north Queensland.

Disaster strikes the Gold Devils with just weeks left in their season, the Gold Retrievers put their gold dreams on the line, and Vince, Bibi and Murray take a big risk investing in new machinery.

Wagga Truck Towing retrieve a 22-tonne cattle truck, Clayton's Towing recover half a million dollars' worth of classic cars, and Parks Towing take on back-to-back emergency jobs.

The Poseidon Crew are forced back onto an old lease in flooded Victoria, Shane and Kate call in help in Western Australia, and Jacqui and Andrew get separated at night in far north Queensland.

The Wildcard crew heads to a risky fishing spot known for sharks, a gamble that puts their season target in jeopardy; with tensions high, pregnant Jess faces a terrifying challenge.

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 melts his collected gold finds in the camp. He celebrates a first major success. Meanwhile, another plant defect completely stops mine owner James. Dropout Sebastian helps Stanley.

Winter storms cripple the Gold Retrievers' new dryblower, wet paydirt forces Shane and Russell to shut down their plant, and the pressure to find gold could finally tear the Ferals apart.

The Poseidon Crew are forced to hunt Victoria's frozen high country, the Goldtimers use the last of their savings on big machinery, and Marcus, Linden and Dale dig deep to uncover gold-rich ground.

Client Mark has always dreamed of owning a chrome bumper MGB convertible, but fixers Sheldon Nichols and Peter Harriott must find clever ways to finance that dream.

Ken fights the dangerous Moose Creek road in a desperate bid for fuel, Karl's sluice is dealt a near-fatal blow, and Big Al is shut out of high-stakes ground.

The Poseidon Crew are poised to secure ground that could hold multi-million-dollar nuggets, Jacqui and Andrew venture into north Queensland, and the Ferals take a gamble on a remote island expedition.

Brent Shannon's gold dream lives or dies at a weigh-in, Shane and Russell venture out on a gruelling 3000km expedition, and new team the Gold Retrievers unearth a bumper payday.

The Wildcard crew heads to a risky fishing spot known for sharks, a gamble that puts their season target in jeopardy; with tensions high, pregnant Jess faces a terrifying challenge.

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

In a special retrospective episode, the miners recap their highs and lows of the season, and reveal their plans for next season.

A surprise offer puts the Poseidon Crew's future in jeopardy; the Wanderers gamble on hard ground; Jacqui and Andrew's hunt for gold sees them follow one of the area's gold mining veterans' footsteps.

Shane decides to try hard rock mining and gets help from an unlikely source, the Mackies put a surprise visitor to work, and Sheryl and Simon scavenge for parts to keep the gold coming in.

A flood forces the Desert Diggers to call for help, new technology leads Jacqui and Andrew to a massive haul of gold, and Shane Calegari returns to Fantasy Gully to help Rusty.

Gordon melts his collected gold finds in the camp. He celebrates a first major success. Meanwhile, another plant defect completely stops mine owner James. Dropout Sebastian helps Stanley.

With commercial airlines carrying over four billion people on scheduled flights in 2017 alone, we take an in-depth look at the impact passengers have on this ever-growing industry.

A team of treasure hunters begin their hunt for a lost fortune in gold - and make an extraordinary discovery near a dry riverbed that proves that they are on the right track.

Never one to miss an opportunity, Ray has snapped up another claim and his plan is to drill a test hole if his drill rig works - meanwhile, Nigel and Rosa Monteith are recent gemfield arrivals.

The crews continue their final push, hoping to hit their quotas at the end of the season. Chris puts in more nets in the hope of making his quota; will it pay off, or blow up in his face?