A stalemate dispute over the world's largest fishery threatens the livelihoods of people.

As the long-awaited crab season begins, hundreds of boats hit the water and one sailor hopes to set a world record.

Newfoundland's biggest dry dock handles critical jobs, and a rookie skipper takes his shot at a tough fishery.

A rookie skipper has a humbling start, and a stranded fishing vessel needs a multi-team recovery.

Heroes fight to save a stranded vessel, and a mysterious 200-year-old shipwreck washes ashore.

The Cooks' latest purchase - a brand-new helicopter - can't seem to get off the ground, and Kurt Hammar's youngest son Kodi has dropped out of school to become a bull catcher.

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.

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.

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.

Irv imports an original-run short wheelbase Porsche 911 from the East coast of America. He needs to make it roadworthy while keeping its incredible sun-faded patina.

Irv is a world-renowned expert in VW Sambas, so when an American collector turns to him with a bunch of rusted panels, and the dream of a showroom quality vehicle, there's only one man for the job.

Shane uses a clever bush fix to get himself out of a jam in the remote outback, and the Gold Retrievers find a gold-rich quartz vein that could hold the motherlode.

The Poseidon Crew battle challenging terrain in the mountains of High Country Victoria, and promising signs could lead the Gold Devils to a million-dollar pay day.

The Gold Devils race against the elements, Jacqui and Andrew push to new extremes, and mechanical issues leave the Ferals divided.

Alan and Salty hit a dead end in the remote Kimberley region, Vince, Bibi and Murray are forced to break new ground in Victoria, and the Gold Retrievers struggle with their misfiring wet plant.

The Gold Devils battle on after losing a team member, the Ferals' nugget trail goes cold, and Jacqui and Andrew face a night-time detecting mission for lost gold.

Nika's brother quits, leaving her and Chris in the lurch at the end of the season.

A look back at some of the most memorable moments from the fourth season, as the miners deal with harsh conditions, mechanical failures and fierce competition.

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

Big Al's health takes a hit while searching for new ground.

Big Al races to open up virgin ground, but his operation grinds to a halt when Hiro's Curse returns.

Mother Nature governs the unwritten codes of survival that dictate the way of life in rural Alaska. At each camp, the residents face challenges securing basic necessities of life.

The Hailstones hunt for springtime waterfowl, and welcome a new addition to the family. Andy must also protect his property from the breaking ice on the Yukon River.

At Bristol County Jail, nearly half the cells have no locks, a design built for lower-level offenders. But rising gang populations and more violent inmates have changed the stakes.

When the hard hat heroes scramble to offload a huge shipment, the heavy-duty mechanics step in to help them pull off the mission.

Mike takes on a 1967 Cougar with a tragic past, the boys battle it out at a swap meet, and the completion of the Model T gets Avery thinking.

A 1969 Road Runner gives Mike a run for his money while his generosity gets out of hand, and shop dog Lincoln gets a special surprise.

Mike battles to finish the Road Runner, trading gets nuts with Big Donny, and the crew help a million-dollar build get to the Detroit Autorama.