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Rory and Oscar are forced to operate their dad's drill rig for the first time. The Tarantos are struck down by sickness, and the Bushmen build a dangerous mine roof.

The Tunnel Rats risk their lives to get a massive digger under the ground. Meanwhile, the Blacklighters are amazed to unearth their largest piece of opal.

As arctic superstorm Elsa intensifies, a rare forecast warns of huge waves. Trapped in the crab-rich northern grounds, one boat faces a 60-foot monster.

During an arctic storm, Cornelia Marie's crane comes off the rails causing injury and damaging equipment. But, this pales into insignificance when Sig gets a phone call.

After the birth of Talbert the giraffe, serious complications arise. Plus, Robert rescues an entangled swan caught in a fishing line.

The zoo awaits the arrival of a snow leopard's fourth cub. A pair of Andean condors embrace their new enclosure, and a squirmy binturong fights his annual vaccination.

In flooded Victoria, the Poseidon Crew are forced back onto an old lease. Jacqui and Andrew get separated at night in far north Queensland.

Former military man, Chance, is paired with naturalist, Melissa, in the Amazon jungle. Humidity, violent storms, caiman, and red-bellied piranha hit them hard.

A country boy teams up with a mother of four and they are dropped into the jaguar-filled jungle of Belize. But, while they hunt for food, something is hunting them.

The team heads over to the machine shop they bought, to see what they can find before renovating the house and determining how many new builds are needed.

The crew heads to Norfolk, Virginia, to test their sea legs and salvage a ferry including lights, skylights and a mural. Grayson helps Mike and Tay with a build.

Winter has come - along with the thinnest, most unpredictable ice in decades. Kris tries to set up and mine in one day and Emily's reliable Claim 14 shocks her.

Only days into the winter mining season, a regulator freeze up cuts off Shawn's air supply. Vernon returns to the ice with an eye to buy Claim 16.

Machinery breakdowns cause tensions to rise in the Poseidon Crew. The Ferals are moved onto a new lease, and the Gold Timers get stranded.

Jeremy Wade explores the dark secrets of a 150-year-old shipwreck off the Mexican coast. Next, he uncovers a boiling river hidden deep in the Amazon.

Opilio season starts with the return of the fabled Cornelia Marie. Now, Josh Harris has bought back the boat that helped make his old man a legend.

Blood is spilled on the Cape Caution, when a brutal storm rips across the Bering Sea. Then, Sig fights to keep the Northwestern from going up in flames.

A famous UFO case occurs above Alaska when an unidentified flying object pursues a Boeing 747. Locals suspect a monstrous bird stalks the skies.

Josh Gates travels to South Africa in search of former President Paul Kruger's missing gold cache. He evades dangerous poachers and meets the Shangaan tribe.

Josh Gates is in Africa's Kalahari Desert seeking a fabled lost city. He encounters wild animals, rafts down rapids and flies in an open-air helicopter.

A young couple face a mire of muddy clay in the Georgia woods. The Raneys must help with unsanitary conditions and crumbling infrastructure.

The Bushmen's new worker faces a dangerous first day on the job. The Tarantos' overworked excavator grinds to a halt, and the Cheals are hit with more breakdowns.

The Bishop invests in a massive new claim, but he has no money left over for equipment. Meanwhile, the Tunnel Rats risk electrocution as they hunt for crystal opal.

A Cornelia Marie deckhand suffers a devastating blow that requires emergency surgery at sea by Casey. Meanwhile, Captain Sig is left behind awaiting news from home.

The fleet deal with back-to-back unrelenting storms on the Bering Sea. Freddy attempts surgery on himself and the Summer Bay Crew receives news on Nick's future.

Captain Joe takes his sons to sea aboard the Redrum, only to witness nature at its rawest. Niko hunts the season's biggest bluefin yet, worth $10,000.

Sig gets blown off course in extreme seas. Jake faces the loss of his longtime engineer. Monte takes the wheel of the Wizard when Keith collapses.

To increase gold production, the Gold Devils attempt to run three machines at once. The Gold Retrievers set a one-week ultimatum to find 10 ounces of gold.

Pro surfer, Anastasia Ashley, and YouTuber, Cory Williams are stranded in the jungles of Belize. Do they have what it takes to survive without food, water or clothes.

Ava, a fashion producer from Seattle and Larry, a paramedic from Kentucky, are in Mexico's hostile Mayan jungle, where a health scare hits the pair hard.

The team returns to the Norfolk ferry to get the large items that were left behind, including a crow's nest and staircase. Mike and Robert have a consultation.

Mike and Tay build a commemorative clock for the town of Kannapolis, North Carolina, before the crew heads back to salvage items left behind on the first trip.

The clock ticks as an impending, violent Arctic storm gathers strength. Kris gambles on another rookie miner and Vernon risks everything to test Claim 16.

Following the Arctic storm that drove everyone to shore, Shawn embarks on a marathon dive and Kris unveils a diving relay with The Reaper's new diver, Shaunna.

An old treasure map leads the Poseidon Crew to a big nugget. Marcus and Linden call in some expert help, while Shane and Russell take a financial gamble.

Jeremy looks at a puzzling military defeat - the Battle of Actium. Next, he examines what could be the first recorded case of a whale rescuing a human.

In Dutch, Sig welcomes their newest greenhorn: his daughter. After four generations of Hansen fishermen, the next in line is an ambitious 18 year old woman.

While the rest of the fleet have their doubts about a woman's place on a crab boat, the Northwestern crew must train their new recruit - Sig's daughter, Mandy Hansen.

A secret government facility in the wilderness may be hiding an extra-terrestrial pyramid. And, are strange forces in the Triangle making wildlife more aggressive.

Josh Gates joins two treasure hunters in the Philippines searching for Yamashita's Gold, which has been hidden since World War II.

Josh Gates searches Mexico for clues behind the mysterious rise and disappearance of Teotihuacan, a powerful civilization that predated the Aztecs in Mesoamerica.

A family in Tennessee's Smoky Mountains finds their homestead failing because they choose to live on the useless side of their land attached to power.

The Misfits search for a new claim in Andamooka's dangerous opal fields. With no working machinery, the Opal Whisperers put their hopes into a bucket of Yowah Nuts.

The Blacklighters are forced to move their 10-ton processing plant to a new claim. Plus, the Cheals try to use abandoned truck parts to fix their agitator machine.

Another powerful winter storm hits as Monte returns to the Wizard after dealing with his dad's funeral arrangements. Plus, Jake is faced with a tough decision.

With the winter crabbing season ending, the fleet battles monster waves. Then, veterans Sig and Steve form an unlikely alliance and Freddy suffers a bloody injury.

Renovating a generational camp at Snow Pond, the team face heat and supply issues as well as plenty of other surprises.

The guys build a log cabin pool house in Mentor-on-the-Lake, Ohio, extending the size of the cabin and incorporating a partition wall.