Kru and Daryl move earth in search of Slumach's gold, and Adam discovers a cave rumoured to be Volcanic Brown's final resting place.

Fresh from the UK, Phil battles flies and 14-hour days on a gruelling haul across the continent; meanwhile, Shelley fights mechanical issues and Melbourne's city chaos on her first paid job.

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.

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.

A 1938 Buick brings out the best in Mike, a classic van delivers nothing but problems, and Mike and Avery hit the dance floor.

On the Magdalen Islands, the snow crab and scallop opening days are hammered by a winter gale, slashed quotas, and gear failures that threaten to sink far more than just the start of the season.

Our railways have been pushing engineering to its limits for over 150 years, but it's the need for speed for train engineers that has inspired the greatest innovations of all.

Donnie hosts a live online auction to sell off the gold he's found at Swiss Diggings. He'll use the money to part-fund the land deal he's been offered. T. Richie may need surgery for his broken hand.

The Dust Devils' critical water supply runs dry, Jacqui and Andrew unearth their biggest haul so far, and torrential rain could shut down the Poseidon Crew for weeks.

Shane and Russell battle freak rains, a blown circuit could destroy the Poseidon Crew's chances of a record weigh-in, and the Ferals deliver their biggest haul of the season.

Ken and Guillaume face breakdowns as a crew member goes AWOL, Bernie's move to Snow Creek seems to be paying off - if he can get his sons to step up - and Al's streak is threatened.

Irv takes on the restoration of an Escort RS1600i from an owner who had to give it up due to ill health. It turns out to be a much bigger job than he imagines.

Rick Fishers pays it forward to a couple of rookies, Ted and Lecky put some hard graft into some hard rock, and when the Dirt Dogs catch some poachers red-handed, things turn a little 'Western'!

Ted and Lecky unearth an ancient mystery that could lead to a hidden treasure trove. Meanwhile, Henri and Kellie are running out of supplies as they race towards the season's finish line.

While Dale struggles to run the family farm and his business, Gripp gets a call from his sister after a terrifying crash and races to help.

Rescue teams save seven fishermen while skippers, divers and hard hats maximise the summer season.

Falling behind schedule in the Camp Cut, Big Al pushes Hiro to his limits in a desperate attempt to start sluicing.

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 Poseidon Crew hope to pull in enough gold in the season's final week to keep the team together, the Gold Devils push their equipment to failure, and the Ferals battle through blistering heat.

As a brutal storm grounds the fleet, the next generation steps up. Left in charge, rookie captain Tyson Scott's chance to beat his father's lobster totals is threatened by a tangled propeller.

The Desert Diggers secure a season-changing deal, the Poseidon Crew expand operations at German Gully to find big gold, and intense summer heat pushes the Wanderers to the brink.

We use passengers' phone footage to reveal what happens when aircraft get hit by typhoons, hailstones, and lightning while learning how aircraft are able to withstand such weather types.

Historic sea ice brings the harbours to a standstill as the heroes fight to keep the island running while making sure that everyone is safe.

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.