Dr. Oakley treats a cat that swallowed a string and a pregnant reindeer with cancer.

Dr. Oakley faces a toxic emergency and removes the eye of an alpaca.

Dr. Oakley transports a bull by boat and sees chinchillas for a cuteness check.

Dr. Oakley treats a limping bison and a litter of puppies struggling to survive.

Dr. Oakley tries to outsmart a herd of bison and fights for the life of a cherished friend.

Dr. Oakley operates on an unusual mass and investigates a musk ox with a hair loss problem.

Dr. Oakley performs a checkup on two scrappy lynx, and Sierra takes charge on clinic day.

Back in the Yukon, the Oakleys help over 100 cattle and a rowdy mini mule.

Dr. Oakley treats a kitten with a bulging eye, and Sierra preg checks a miniature cow.

Dr. Oakley treats a beagle mix with a severely infected paw and rappels to an eagle's nest.

Dr. Oakley herds a group of unruly reindeer and treats a mini ram with a limp.

Dr. Oakley treats an electrocuted sloth and releases rescued animals back into the wild.

In Costa Rica, Dr. Oakley handles a pair of jaguars and a sloth in heat.

Dr. Oakley herds a group of unruly reindeer and treats a mini ram with a limp.

Dr. Oakley treats an electrocuted sloth and releases rescued animals back into the wild.

In Costa Rica, Dr. Oakley handles a pair of jaguars and a sloth in heat.

Dr. Oakley treats a cat that swallowed a string and a pregnant reindeer with cancer.

Dr. Oakley faces a toxic emergency and removes the eye of an alpaca.

Dr. Oakley transports a bull by boat and sees chinchillas for a cuteness check.

Dr. Oakley treats a limping bison and a litter of puppies struggling to survive.

Polar drivers Lisa, Art and Todd start on an epic journey up the longest seasonal winter road in the world; VP stays closer to home, traveling dangerous roads in a late attempt to boost their load count.

The fundamental creation of the wheel helps shape the human experience, but if the wheel suddenly stopped working and society lost the greatest, game-changing accomplishments made using wheel technology, the world would be vastly different.

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Honesty is the best policy, even for ex-cons; A student gets the dish on declaring items properly.

The fundamental creation of the wheel helps shape the human experience, but if the wheel suddenly stopped working and society lost the greatest, game-changing accomplishments made using wheel technology, the world would be vastly different.

Now in a wheelchair, Big Al returns to gold mining; Bernie clashes with his son; Karl finds gold right away; Chris reunites with his partner and their kids.

Tim and Fuzz start off with Andy's Ford Pop hot-rod, a highly modified car from the 1950s; it is bent, broken and full of rust.

With town planner Maz suffering from a serious genetic disorder, Tim and Fuzz work on restoring his iconic BMW E30 Alpina, which they find may or may not be a genuine Alpina.

When Brian starts suffering from health problems, the project of restoring his XR2 to show-winning condition comes to a halt; Tim and Fuzz step in.

Fuzz Townshend and Tim Shaw aim to help refrigeration engineer Tim, whose life has been blighted by a cruel genetic condition, as they take on their first-ever Honda.

Tim and Fuzz restore a Citroen SM, widely considered one of the best French cars, after it suffers catastrophic engine failure on its first outing.

Fuzz Townshend and Tim Shaw head to Norfolk to take on a 1962 TVR Grantura, that has been off the road for nearly 50 years.

Tim and Fuzz are out to help Darren, who was left disabled after a tragic road accident in which he saved his grandson, by fixing up his iconic 1989 Golf.

Fuzz Townshend and Tim Shaw restore a "Triumph TR7," one of the most divisive British sports cars ever made.

Tim and Fuzz are in unknown territory as they take on 28-year-old Charlie's Lexus IS200 and transform it into a full-blown drift car.

Archaeologists investigate Egypt's ancient power struggle with the Nubians.

Chef Gary Mehigan experiences the cultural splendor of Nagaland's famed Hornbill festival, an annual celebration which represents the richness of local traditions.

The filmmakers explore how India's monsoon forest is a place of both sanctuary and extremes, where all must live by the law of the seasons.

Archaeologists investigate Egypt's ancient power struggle with the Nubians.

Chef Gary Mehigan experiences the cultural splendor of Nagaland's famed Hornbill festival, an annual celebration which represents the richness of local traditions.

The filmmakers explore how India's monsoon forest is a place of both sanctuary and extremes, where all must live by the law of the seasons.

Tim and Fuzz start off with Andy's Ford Pop hot-rod, a highly modified car from the 1950s; it is bent, broken and full of rust.

With town planner Maz suffering from a serious genetic disorder, Tim and Fuzz work on restoring his iconic BMW E30 Alpina, which they find may or may not be a genuine Alpina.

When Brian starts suffering from health problems, the project of restoring his XR2 to show-winning condition comes to a halt; Tim and Fuzz step in.

Fuzz Townshend and Tim Shaw aim to help refrigeration engineer Tim, whose life has been blighted by a cruel genetic condition, as they take on their first-ever Honda.

Airport officers let the khat out of the bag; A repeat offender must prove he's learned his lesson.

A traveler has suitcases full of surprises; A Canadian couple returns home with a man-eating beast; two Americans tow their friend's boat to Alaska.

The dogs are brought in to assist officers; A traveler goes gaga at Vancouver International Airport.

Officers question a nervous traveler; a trampoline installer hopes to avoid the bounce around; undeclared dogs from Hungary.

Exploring what the world would be like if salt and all of its vital contributions, from food preservation to enabling industry, were to suddenly disappear.

Karl finds new gold with old maps; Nika and Chris find their first gold of the season; Bernie struggles to get started.

Big Al opens a new pit and Chris' dozer gets stuck; Karl struggles to find gold after a heavy rain; Bernie pushes his plant to its limit.

Airport officers let the khat out of the bag; A repeat offender must prove he's learned his lesson.

A traveler has suitcases full of surprises; A Canadian couple returns home with a man-eating beast; two Americans tow their friend's boat to Alaska.

The dogs are brought in to assist officers; A traveler goes gaga at Vancouver International Airport.

Officers question a nervous traveler; a trampoline installer hopes to avoid the bounce around; undeclared dogs from Hungary.

A mom with kids in tow smuggles coke; AMO shoots out a drug boat's motor.

HSI chase down a drug smuggler during a cocaine transfer at a parking lot; CBP discovers gold coins and ancient artifacts in mail parcels.

CBP finds $200k of weed in luggage; HSI disrupts a Colombian counterfeit ring.

Features HSI running multiple undercover drug deals; CBP discovers coke hidden in oatmeal.

HSI tracks shipment of 246kg of cocaine; CBP seizes illicit ammo and cash.

Homeland Security Investigations Miami uncovers a mysterious new drug; CBP discovers invasive African snails in mail.

CBP uncovers smuggled human remains; Border Patrol stops migrant smugglers.

CBP Dulles finds outbound drugs; Border Patrol tracks human smugglers.

The Royal Navy orchestrates a spectacular drug bust, and the Coastguard spots suspicious people in the marina, which triggers an investigation.

Divers abandon their anti-drug operation to attend to a potential drowning.

CBP Dulles finds outbound drugs; Border Patrol tracks human smugglers.

The Royal Navy orchestrates a spectacular drug bust, and the Coastguard spots suspicious people in the marina, which triggers an investigation.

Divers abandon their anti-drug operation to attend to a potential drowning.

A mom with kids in tow smuggles coke; AMO shoots out a drug boat's motor.

HSI chase down a drug smuggler during a cocaine transfer at a parking lot; CBP discovers gold coins and ancient artifacts in mail parcels.

CBP finds $200k of weed in luggage; HSI disrupts a Colombian counterfeit ring.

Features HSI running multiple undercover drug deals; CBP discovers coke hidden in oatmeal.

A chef with limited funds and no return ticket; serial numbers aren't piecing together in a gun shipment; a travel agent's last-minute Caribbean booking raises red flags; a boat owner fails to report to CBSA.

Officers get the dope on a traveler's rap sheet; A passenger is unsure of his luggage contents.

Suspicious x-rays; an MMA fighter's story; an RV search that reveals unusual weapons; a cross-border car sale.

A businesswoman's personal items sound alarms; a cargo ship crew member who has been concealing in the ceiling; a puppeteer couple; an American seeking legal advice in Ontario.

The world is literally buzzing with insects; bees, spiders and insects of all shapes and sizes touch every aspect of life, they're the essential workers that pollinate food, clean up the dead and are an integral part of the ecosystem.

Nika and Chris face breakdowns and water problems; Ken's wife wants him home for their child's birth; Bernie's son goes AWOL.

Big Al's gamble pays off; Bernie argues with his son Justin; Ken and Guillaume sluice before Ken has to leave for his child's birth; Karl's team tries to sluice 200 ounces of gold in a week.

A chef with limited funds and no return ticket; serial numbers aren't piecing together in a gun shipment; a travel agent's last-minute Caribbean booking raises red flags; a boat owner fails to report to CBSA.

Officers get the dope on a traveler's rap sheet; A passenger is unsure of his luggage contents.

Suspicious x-rays; an MMA fighter's story; an RV search that reveals unusual weapons; a cross-border car sale.

A businesswoman's personal items sound alarms; a cargo ship crew member who has been concealing in the ceiling; a puppeteer couple; an American seeking legal advice in Ontario.

Operating under a noise curfew, Sydney Airport faces pressure to complete 900 plane movements in a day; duty manager George is confronted by a suspicious package.

Baggage manager Kevin has a rough day trouble-shooting a number of mechanical breakdowns; security screening discovers a passenger travelling with a gun.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Torrential rain closes two runways as an incoming flight deals with an onboard medical emergency; a fire training drill turns into a real emergency.

Sydney Airport is on high alert for the arrival of the Prime Minister of Singapore, and Duty Manager Mel's favorite pop star; security searches for a woman reported to have collapsed on the street.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Security breaches, an air ambulance emergency, drugs found in an unattended bag and an angry passenger add up to a busy Friday for Duty Manager George.

Fresh from nine months of training at the Border Force Academy, Labrador Warner faces his first day on the job as a drug sniffer; security managers test their screening teams by trying to smuggle a fake bomb past them.

Mariana investigates the growing influence of heavily armed militias.

Can investigators identify a young man burned alive in Atlanta in 1996?

Fresh from nine months of training at the Border Force Academy, Labrador Warner faces his first day on the job as a drug sniffer; security managers test their screening teams by trying to smuggle a fake bomb past them.

Mariana investigates the growing influence of heavily armed militias.

Can investigators identify a young man burned alive in Atlanta in 1996?

Operating under a noise curfew, Sydney Airport faces pressure to complete 900 plane movements in a day; duty manager George is confronted by a suspicious package.

Baggage manager Kevin has a rough day trouble-shooting a number of mechanical breakdowns; security screening discovers a passenger travelling with a gun.

An emergency training exercise encounters disturbance due to dangerous winds, flight board failure, and a real-life emergency of an explosion in a passenger terminal.

Torrential rain closes two runways as an incoming flight deals with an onboard medical emergency; a fire training drill turns into a real emergency.

Partygoers receive rave reviews at the Coutts crossing; officers delve into an international affair.

Cookies can be more trouble than treat; twins with matching beers take a wrong turn.

Officers make a stunning discovery; a tourist's papers hint at her true plans for coming to Canada.

A senior has some unfriendly gear in his RV; a Canadian returning from Panama tells all.

Examining the history of cats and dogs and how they have been helpful companions to humankind all over the globe.

Nika and Chris face a repair they can't afford; Guillaume has trouble while Ken is gone; Karl asks his family for help; Bernie gets a surprise.

Breakdowns shut down Chris' mine; Big Al remembers his wife's death; Ken and Guillaume try to save their season; Bernie and his team have a big payoff.

Partygoers receive rave reviews at the Coutts crossing; officers delve into an international affair.

Cookies can be more trouble than treat; twins with matching beers take a wrong turn.

Officers make a stunning discovery; a tourist's papers hint at her true plans for coming to Canada.

A senior has some unfriendly gear in his RV; a Canadian returning from Panama tells all.

As seasons change, Alaskans must be vigilant in their quest for survival.

The team is in the crystal-clear waters of Bimini in the Bahamas to witness the incredible journey of the great hammerhead shark; as the team follows the shark's migration, they discover the secrets of how these animals navigate the vast ocean.

The team travels to the Dominican Republic in the Caribbean to reveal the greatest secrets in the lives of the North Atlantic humpback whale; they witness a mother defend her calf in the ultimate ocean battle with a pack of orcas.

The team is in the Azores to tag the sixgill shark and learn more about its nightly patterns hunting for food in the abyss; the team tags and retrieves valuable data, uncovering why this shark undertakes its epic journey from the depths at night.

In the Azores, the team follows the elusive sperm whales to their hunting grounds a mile beneath the surface, where they discover the secret lives of these deep-diving whales.

Learning how a population of bowhead whales, once hunted almost to extinction, is faring today; the team is the first to observe the feeding strategies of the deep-sea Greenland shark, an animal that can live for more than 400 years.

The team's mission is to figure out if Svalbard's polar bears are adapting to their environment; they face this giant of the Arctic Ocean and scale a glacier to learn how much time is left for one of the most critical habitats for polar bears.

An approaching spring brings new opportunities for subsistence living.

Tim Shaw and Fuzz Townshend undertake dramatic automobile interventions across the U.K.

In one night, over 1000 Allied sailors perish when four cruisers go down in flames; Petrel searches for the cruisers in a graveyard littered with ships.

An approaching spring brings new opportunities for subsistence living.

Tim Shaw and Fuzz Townshend undertake dramatic automobile interventions across the U.K.

In one night, over 1000 Allied sailors perish when four cruisers go down in flames; Petrel searches for the cruisers in a graveyard littered with ships.

As seasons change, Alaskans must be vigilant in their quest for survival.

The team is in the crystal-clear waters of Bimini in the Bahamas to witness the incredible journey of the great hammerhead shark; as the team follows the shark's migration, they discover the secrets of how these animals navigate the vast ocean.

The team travels to the Dominican Republic in the Caribbean to reveal the greatest secrets in the lives of the North Atlantic humpback whale; they witness a mother defend her calf in the ultimate ocean battle with a pack of orcas.

The team is in the Azores to tag the sixgill shark and learn more about its nightly patterns hunting for food in the abyss; the team tags and retrieves valuable data, uncovering why this shark undertakes its epic journey from the depths at night.

An American is busted trying to catch a different kind of trip; officers help a tipsy traveler.

A heavy automobile container hints at trouble; A student's stash of food brings him discomfort.

A traveler returns with a surprise; Marine officers come upon an infested container.

A student is failing his customs exam; officers prevent an artifact from going down in history.

Massive and sophisticated contributions from Korea have shaped our modern world, from ancient advances like the greenhouse and armoured boats to modern screen technology, online gaming, E-sports and K-Pop.

Nika's little brother gets in the way; Big Al is shut down; Ken and Guillaume's plan turns into a disaster; Karl and his crew go to a golf tournament.

Big Al makes one last effort to keep sluicing; Karl brings in help to hit his goal; Chris and Nika check their gold haul.

An American is busted trying to catch a different kind of trip; officers help a tipsy traveler.

A heavy automobile container hints at trouble; A student's stash of food brings him discomfort.

A traveler returns with a surprise; Marine officers come upon an infested container.

A student is failing his customs exam; officers prevent an artifact from going down in history.

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

Fueled by fear, two brothers turn against each other in deadly attacks.

Cesar rehabs an aggressive Labradoodle with an alarming history of biting.

Cesar rehabs an over-policing pit mix and a space-invading mini schnauzer.

Cesar helps shed the pounds of an overweight pit mix.

Cesar matches a rescue dog with a family & inspires them to be leaders.

Paraplegic pet mom struggles to manage fighting bulldogs on her own.

Phil Breslin heads out into the deep blue ocean for a close encounter with the tiger shark, the manta ray and the humpback whale.

Phil Breslin heads into the mangroves to track down a mud crab and a shovelnose ray while getting attacked by a swarm of mosquitoes.

The filmmaker sheds light on the Komodo dragon on Rinca Island, Indonesia, who must stay active to survive.

Dr. Oakley competes in a rodeo and treats a dog with persistent nosebleeds.

Phil Breslin heads out into the deep blue ocean for a close encounter with the tiger shark, the manta ray and the humpback whale.

Phil Breslin heads into the mangroves to track down a mud crab and a shovelnose ray while getting attacked by a swarm of mosquitoes.

The filmmaker sheds light on the Komodo dragon on Rinca Island, Indonesia, who must stay active to survive.

Dr. Oakley competes in a rodeo and treats a dog with persistent nosebleeds.

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

Fueled by fear, two brothers turn against each other in deadly attacks.

Cesar rehabs an aggressive Labradoodle with an alarming history of biting.

Cesar rehabs an over-policing pit mix and a space-invading mini schnauzer.

The canine unit brings home the bacon; A traveler discovers she's got a friend in high places.

Joining dedicated teams of agents at Canada's airports and seaports as they intercept visitors smuggling illegal contraband and tourists with tall stories.

A captain navigates troubled waters when he forgets to declare himself to the authorities.

An American arrives at customs with firearms; a traveler makes a breathtaking statement.

Mexico's gifts to the world include the tomato, the avocado, tacos, tequila, Frida Kahlo, Oscar-winning directors, Mexican wrestling, Latino pop music, silver, rubber, and Mayan astronomy.

Big Al risks his health to break even; Nika's brother makes a surprising decision; Ken and Guillaume dig deep; Karl tries to top his goal.

Nika's brother quits, leaving her and Chris in the lurch at the end of the season; Ken and Guillaume dig deep to get one final big pay day.

The canine unit brings home the bacon; A traveler discovers she's got a friend in high places.

Joining dedicated teams of agents at Canada's airports and seaports as they intercept visitors smuggling illegal contraband and tourists with tall stories.

A captain navigates troubled waters when he forgets to declare himself to the authorities.

An American arrives at customs with firearms; a traveler makes a breathtaking statement.

New discoveries reveal the secrets of Roman gladiators' enduring appeal.

Archaeologists dig in Pompeii to uncover the dark side of the idyllic Roman city by finding the room of an enslaved person.

The Bible describes Nineveh as a wicked city of sin; finding if new discoveries in Iraq and Israel can shed light on the events behind this fearsome reputation.

New discoveries unlock the origins of the Bible's flood story.

Archaeologists discover evidence that sheds fresh light on historical influences from Egypt for the biblical tale of the Exodus.

Archaeologists discover new evidence in Iraq that sheds light on the historical influences of the Bible's Tower of Babel story.

Archaeologists make groundbreaking discoveries about the world of Solomon.

Many persons revile King Herod as one of the evil characters in the Bible; later historians coin him Herod "the Great.".

LA HSI executes undercover drug buys; CBP intercepts Coyotes at the border.

With winter on its way, Sam and Squibb band together to build Curly a hoist.

Many persons revile King Herod as one of the evil characters in the Bible; later historians coin him Herod "the Great.".

LA HSI executes undercover drug buys; CBP intercepts Coyotes at the border.

With winter on its way, Sam and Squibb band together to build Curly a hoist.

New discoveries reveal the secrets of Roman gladiators' enduring appeal.

Archaeologists dig in Pompeii to uncover the dark side of the idyllic Roman city by finding the room of an enslaved person.

The Bible describes Nineveh as a wicked city of sin; finding if new discoveries in Iraq and Israel can shed light on the events behind this fearsome reputation.

New discoveries unlock the origins of the Bible's flood story.

Lisa has to decide help a competitor push further into the arctic unknown or go back to Polar headquarters with her teammates.

The Dawson City Fire Department races to protect the town from devastating flash floods; officers track down a dangerous and destructive bison herd, have a run-in with a bear and set up a sting to catch a suspected serial over-fisher.

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Cameras follow U.S. border protection agencies as they man the front lines of national security.

The Dawson City Fire Department races to protect the town from devastating flash floods; officers track down a dangerous and destructive bison herd, have a run-in with a bear and set up a sting to catch a suspected serial over-fisher.

The docs lean on their vet techs to save a beloved sick chicken, help a giant schnauzer, and acclimate some wild bass to a new home.

The docs see a goat with severe bloating, a boa constrictor that refuses to feed, and a turtle infected with parasitic "vampire worms.".

The Docs at Critter Fixer treat a rescued pigeon with a surprising injury.

The Docs at Critter Fixer attempt to remove an egg from a cockatiel.

The docs at Critter Fixer attempt to MacGyver a turtle's broken shell.

The Docs at Critter Fixer provide inspiration to animals and humans alike.

The docs get up close and personal with venomous snakes, help a dog whose face droops, and send a diabetic canine on the road to recovery.

The docs at Critter Fixer remove record-breaking kidney stones from a dog.

The docs at Critter Fixer embark on their new "Vet for a Day" national tour.

With extra scenes; the docs work to keep the clinic clean while meeting an adventurous cockatiel, an eager beaver and a cow that takes them surfing.

The docs at Critter Fixer operate on an eel and perform a snake C-section.

The Docs are awarded keys to the city for years of community service; helping a red tail boa; introducing a kid to a kid.

The docs at Critter Fixer help 15 celebrity chihuahuas and a baby duckling.

The docs at Critter Fixer operate on an eel and perform a snake C-section.

The Docs are awarded keys to the city for years of community service; helping a red tail boa; introducing a kid to a kid.

The docs at Critter Fixer help 15 celebrity chihuahuas and a baby duckling.

The docs lean on their vet techs to save a beloved sick chicken, help a giant schnauzer, and acclimate some wild bass to a new home.

The docs see a goat with severe bloating, a boa constrictor that refuses to feed, and a turtle infected with parasitic "vampire worms.".

The Docs at Critter Fixer treat a rescued pigeon with a surprising injury.

The Docs at Critter Fixer attempt to remove an egg from a cockatiel.

Experts predict one of the shortest and warmest winters on record; as a result, companies risk financial ruin and communities face deprivation unless the drivers can deliver vital supplies before their window of opportunity slams shut.

Conservation Officer Logan has a close call while investigating a case of poaching; an aggressive grizzly bear ransacks a remote trapper's cabin.

Paid programming.

An irritated traveler pushes officers to the limit; Haitian fruits may contain more than vitamins.

Conservation Officer Logan has a close call while investigating a case of poaching; an aggressive grizzly bear ransacks a remote trapper's cabin.

When a bear charges a group of remote researchers, a Conservation Officer deals with the potentially life-threatening situation, and Ray takes on a challenging recovery that bested two tow companies before him.

Finland's impressive defence in the Second World War and the nuclear age.

How Britain defended itself from invasion for nearly a thousand years.

The story of Poland's survival, against all the odds.

The story of the Netherlands' most powerful defence - water.

The ingenious fortress designs used to defend France.

Spain's impressive fortifications in a dramatic history of conflict.

A big bomb explodes outside a federal building in Oklahoma City.

The risk of a second bomb explosion causes widespread panic and leads to the evacuation of the bomb site; despite their convictions, rescuers must leave the trapped and frightened survivors behind.

Oklahomans and the nation seek justice as the bomber awaits his fate.

Archaeologists uncover the secrets and rivalries of Egypt's last dynasty.

Chef Gary Mehigan lands in Kolkata to soak in the festive spirit of Durga Puja, a Hindu festival where devotees celebrate Goddess Durga's victory over evil.

Herds of India's giant grazers; one-horned rhinoceroses, wild buffalo and Asian elephants.

Archaeologists uncover the secrets and rivalries of Egypt's last dynasty.

Chef Gary Mehigan lands in Kolkata to soak in the festive spirit of Durga Puja, a Hindu festival where devotees celebrate Goddess Durga's victory over evil.

Herds of India's giant grazers; one-horned rhinoceroses, wild buffalo and Asian elephants.

Finland's impressive defence in the Second World War and the nuclear age.

How Britain defended itself from invasion for nearly a thousand years.

The story of Poland's survival, against all the odds.

The story of the Netherlands' most powerful defence - water.

A woman returning from a trip to China has business cards to a Sydney brothel and passports for three Chinese girls.

A piece of salmon comes up positive for cocaine; Syrian carpets have something suspicious woven into the fabric.

A man arrives from Beijing with strong readings for narcotics; three men want to visit a temple that hasn't been built yet.

Frigid temperatures wreak havoc on Dawson City, putting the fire department in danger; an avalanche shuts down the Klondike Highway and a tow operator races to find a driver who has plunged off-road and into an icy river.

Art Burke crashes his truck into a snowbank; Alex Debogorski makes his return and faces off with an untested crossing; Mark Kohaykewych tests out new driver Steph Custance; Lisa Kelly faces a monster incline; Darrell Ward runs into rival Todd Dewey.

It's up to Adam to push forward and guide the team through the uncharted terrain of Corbold Canyon.

A woman returning from a trip to China has business cards to a Sydney brothel and passports for three Chinese girls.

A piece of salmon comes up positive for cocaine; Syrian carpets have something suspicious woven into the fabric.

A man arrives from Beijing with strong readings for narcotics; three men want to visit a temple that hasn't been built yet.

Sam and Troy embark on a treasure dive while Mary takes a shot at a buck.

Curly fires the first rounds of duck season; Oliver hunts for fresh crab.

Killer wolves turn a quiet duck hunt deadly for Tim Curly Leach.

Breanna's mission for deer leads her to some unsettling signs.

Breanna and Oliver go shrimping, while Sam and Curly net for salmon.

Matt and Carl prepare for adventure; Oliver chases after deer.

The search for crab takes residents into a dangerous new environment.

HSI finds cocaine hidden in frozen avocado paste; CBP recovers stolen cars.

HSI busts meth smugglers in San Diego; CBP intercepts drug body carriers.

The team chases a notorious drug trafficker who tries his luck again.

HSI finds cocaine hidden in frozen avocado paste; CBP recovers stolen cars.

HSI busts meth smugglers in San Diego; CBP intercepts drug body carriers.

The team chases a notorious drug trafficker who tries his luck again.

Sam and Troy embark on a treasure dive while Mary takes a shot at a buck.

Curly fires the first rounds of duck season; Oliver hunts for fresh crab.

Killer wolves turn a quiet duck hunt deadly for Tim Curly Leach.

Breanna's mission for deer leads her to some unsettling signs.

A woman's belongings are positive for heroin; a Malaysian man arrives looking for work.

A woman with protruding pants attracts the attention of Customs; a passenger would rather go to court than pay a fine.

A woman tries to smuggle an expensive gift into Australia; a package from Hong Kong looks suspicious.

A fidgety passenger has officers on high alert because of what's found under his home's floorboards.

Multiple 911 calls push Dawson City to the brink as they battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

Lisa Kelly finds herself stranded hundreds of miles from the nearest town; Darrell Ward takes an off-road shortcut; Art Burke encounters a melting ice crossing and a full load; Steph Custance finds out whether she'll become part of the Polar team.

According to a 1980s author and historian, the Spanish have a long and hidden history of gold exploration in Pitt Lake, and Slumach found their cache.

A woman's belongings are positive for heroin; a Malaysian man arrives looking for work.

A woman with protruding pants attracts the attention of Customs; a passenger would rather go to court than pay a fine.

A woman tries to smuggle an expensive gift into Australia; a package from Hong Kong looks suspicious.

A fidgety passenger has officers on high alert because of what's found under his home's floorboards.

In this enhanced episode, the causes of three disasters are dissected.

Three real-world disasters forensically dissected - Deepwater Horizon explosion, the Concorde crash and the funicular fire at Kaprun.

The causes of three disasters involving a high-rise, a submarine and a subway station are dissected.

In this enhanced episode, the causes of three disasters are dissected, a nuclear plant, a tunnel and a department store.

Enhanced; three real-world disasters dissected: in space, a train and a high-rise.

Enhanced; three real-world disasters dissected: nuclear missile, ferry and oil rig.

In this enhanced episode, the causes of three disasters are dissected; Lac-Mégantic train crash, Imperial Sugar refinery explosion and Ever Given container ship accident.