The final week of the season sees the Gold Gypsies plagued by more bad luck and the Victoria Diggers face a death in the family - can the Poseidon Crew's optimism help them reach their targets?

Eric gets his 60-metre super-quad wedged completely stuck on a roundabout, and 22-year-old Roy takes on his first-ever triple trailer job.

The Goldtimers gamble their last $6,000, Brad and Chris get expert advice that lands them some gold, and the Ferals face a killer snake.

On the cusp of completing their biggest job of the year, Liz leads Team Cook through dust, mud, and barbed wire - meanwhile, Clarry is determined to make target for his Indigenous clients.

Jack makes it out to sea. The rest of the fleet are hunting in deep water. Bryce's antics are causing tempers to fray.

A deadly explosion strikes a major crude oil port creating an inferno of epic proportions in Corpus Christi, Texas; experts uncover a failed dredging operation that ruptured a propane pipeline.

On Vancouver Island, surfers, scientists, and a Tla-o-qui-aht carver brace for the Cascadia mega-quake - not if, but when.

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.

Mike fixes a 1961 Cadillac to showcase and smash to pieces at Rust Valley's annual Demolition Derby, and mechanic Dave enters a 1974 Chrysler New Yorker for the big event.

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.

The Scrappers are just over halfway to their target but bleeding money; the Gold Gypsies are desperate to find their final 30 ounces; the Mahoneys return to their 8-Mile lease earlier in the season.

The Dirt Dogs' one-million dollar target looks like a far-fetched dream; the Mahoneys are over $22,000 of gold short of their target; Rick is close, but finding that final $1,600 of gold is tough.

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.

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 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.

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.

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.

As the historic 150th Magdalen Islands lobster season begins, Steven and a handful of other captains break the unwritten rules of the islands by border-hopping to northern waters.

Scott Mann, a retired Green Beret officer, is at home when he receives a text that changes his life; his old friend Nezam, an Afghan commando who fought alongside the Americans, is being hunted.

The terror group ISIS has been forcing women into sex slavery; Delta Force operator Jeff Tiegs embarks on a solo mission to buy their freedom and brokers a tense deal with a ruthless ISIS gangster.

The $50,000 dryblower at the 1870 mine is generating much-needed gold, and Ritchie heads to the Gold Coast to try to sell a showpiece gold nugget for $30,000 to one of his cashed-up socialite mates.

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.

A rescue pilot frees rehabilitated raptors, fishers hunt elusive rockfish, and a First Nation fights to bring its salmon home.