New 'hired hands' team The Ferals battle intense 40°C temperatures, The Poseidon Crew use old clues to uncover a bumper payday, and the Dust Devils launch their biggest and riskiest project ever.

Desperate to salvage the second week of their season as Shane and Russell return to the outback, the Poseidon crew fire up their million-dollar washplant, hunting their highest season target ever.

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 Poseidon Crew hunt a remote mountain pass, a gold drought puts huge pressure on Jacqui and Andrew, Levi and Bridget are left to hunt alone, and the Ferals hunt in the extreme Pilbara region.

Gale-force winds tear across the outback, causing pandemonium for bull catchers; when hats and helicopters are tossed around by 40-knot winds, Kurt must weigh his goals against the safety of his team.

Bryce pranks a superstitious Squizzy. Myles is under attack from Sea Lice and Jack hits a rock and is in deep trouble.

The construction of a parking garage in 2007 at a luxury waterside condo turns disastrous as it collapses in Jacksonville, Florida; experts uncover critical design flaws and unsupported lower levels.

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.

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.

Brent and his son Cayden set off on an adventure to find highly valuable crystalline gold, the Wanderers are forced to protect their patch from prying eyes, and Sheryl and Simon hit it big.

Mike restores a 1938 International Harvester, the shop holds a swap meet, and wedding bells ring for Greg.

Chris and Nika's best start ever may be blown by a good deal gone bad.

The season is ending and the Dirt Dogs have to deliver $233,000 of gold to reach their target. Alex's mining partner Rod quits the Scrappers team and the Gold Gypsies overcome gold thieves once more.

The Dirt Dogs invest in a huge hard rock mining plant while a new team from Victoria dig for million dollar nuggets. The Gold Gypsies are back and buoyed by last season's gold haul.

After a brutal year of pain and pushing through, Dale pins his hopes on a life-changing surgery while Gripp steps up to carry the load.

The miners realise that Greenland's harsh environment is a monumental challenge; with their equipment not good enough and finding nothing but rocks, Ray begins to wonder if he's done the right thing.

Chris and Nika's best start ever may be blown by a good deal gone bad.

The Ferals are on the brink of collapse, Shane and Russell could hit the richest gold patch of their season, and Jacqui and Andrew battle back-breaking ground that could ruin their latest deal.

The Poseidon Crew are running out of time to find a 1000-ounce nugget, the Gold Retrievers attempt to escape dangerous summer heat, and the Goldtimers confront the extremes and uncover a massive haul.

Irv finds the holy grail of VW: the Beetle. It's just miles from his garage, so he makes it his mission to breathe new life into this 75-year-old cable-break classic.

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.

Reza investigates the evidence of Persian leopards' existence in the mountains of Iraqi Kurdistan.

In Germany, engineers battle groundwater, tight space and complex logistics to build Frankfurt Airport's Terminal 3 - a vast new mega hub designed to handle 19 million passengers a year.

Huge floods and a mini tornado have almost paralysed Gemfields, but the district has been desperate for water for years, and a little destruction won't stop the miners from trying.

A rescue team races to save a seal pup and an ailing sea lion as scientists hunt what's killing the coast's vanishing grey whales.