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.

Lisa Kelly and Steph Custance team up for a challenging passage on the icy terrain; Art Burke brings a split load into the north country, hoping this will be his last load of the year; Todd Dewey hauls a double oversized camp shack.

Cam and his crew hurry to begin sluicing Donovan cut; Karl motivates his crew; Chris and Nika face a sluice plant breakdown.

Cam and his crew hurry to begin sluicing Donovan cut; Karl motivates his crew; Chris and Nika face a sluice plant breakdown.

The Inland Enforcement Team track down an alleged German sex offender; a detector dog sniffs out trouble in an unclaimed suitcase from Dubai.

Cam and his crew hurry to begin sluicing Donovan cut; Karl motivates his crew; Chris and Nika face a sluice plant breakdown.

In this special episode, Cesar helps three pandemic pups with big problems.

Cesar helps two families with big problems.

Cesar helps three families with quirky pups.

Cesar helps two families with disrespectful pups.

In this special episode, Cesar helps two families with pairs of hyper pups.

In this special episode, Cesar helps three families with doggie dilemmas.

In this special episode, Cesar helps two pups with scared pet parents.

Cesar rehabs an overprotective Belgian Malinois and a puppy with no leadership.

A pet parent unknowingly trains his pit bull to attack cleaning objects.

Cesar rehabs a sound sensitive sheepdog and a confused golden retriever.

Cesar helps a back-of-the-pack biter and his pet parent shed their fear.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a back-of-the-pack biter and his pet parent shed their fear.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

Cesar helps a pet parent whose three dogs battle to the point of bloodshed.

In this special episode, Cesar helps three pandemic pups with big problems.

Cesar helps two families with big problems.

Cesar helps three families with quirky pups.

Cesar helps two families with disrespectful pups.

Drivers head out one last time during the spring thaw; Steph Custance slides into trees; Todd Dewey struggles with a load on a twisty trail; Art Burke retrieves a heavy bulldozer; Reno Ward's truck dies on the ice; Lisa Kelly gets an emergency call.

Gold, the shiny precious metal that has been cherished through all recorded time, is vital to the modern world; if gold was suddenly stripped away, the technological and cultural world would be left reeling.

Drivers head out one last time during the spring thaw; Steph Custance slides into trees; Todd Dewey struggles with a load on a twisty trail; Art Burke retrieves a heavy bulldozer; Reno Ward's truck dies on the ice; Lisa Kelly gets an emergency call.

Gold, the shiny precious metal that has been cherished through all recorded time, is vital to the modern world; if gold was suddenly stripped away, the technological and cultural world would be left reeling.

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

AMO seizes over 280 kilos of cocaine and $750,000 from smuggling vessels.

Caribbean AMO agents bust a smuggling ring and seize 1300 kilos of cocaine.

HSI arrests 37 gang members; AMO seizes $5.4 million worth of cocaine.

HSI arrests drug traffickers; AMO seizes $13.2 million of coke on a beach.

AMO seizes over $60 million of cocaine out at sea.

AMO seizes $8 million of coke; HSI foils a port smuggling operation.

AMO discovers over 80 kilos of cocaine washed ashore in St. Thomas.

A high speed chase ending in the BVI lands AMO 1,800 kilos of coke.

The department finds boats in Puerto Rico containing 350 kg of coke and multiple guns.

A pursuit off the coast off Vieques ends by seizing 907 kg of cocaine.

Marcus Attilius, citizen-turned-gladiator, fights for survival in Pompeii.

Rediscovering the true legacies of queens Cleopatra, Nefertiti and Hatshepsut.

A pursuit off the coast off Vieques ends by seizing 907 kg of cocaine.

Marcus Attilius, citizen-turned-gladiator, fights for survival in Pompeii.

Rediscovering the true legacies of queens Cleopatra, Nefertiti and Hatshepsut.

AMO seizes over 280 kilos of cocaine and $750,000 from smuggling vessels.

Caribbean AMO agents bust a smuggling ring and seize 1300 kilos of cocaine.

HSI arrests 37 gang members; AMO seizes $5.4 million worth of cocaine.

HSI arrests drug traffickers; AMO seizes $13.2 million of coke on a beach.

A Canadian wanted in Alberta is stopped en route to Ecuador; a parcel of baby food contains surprising ingredients.

A Russian dissident's complicated past raises questions for officers; a Korean tourist's resume and school diplomas raise eyebrows.

The Inland Enforcement Unit tracks a pair of Honduran drug runners; an American tourist seems to have already put down roots in Canada.

Trouble looms for a young Asian woman carrying someone else's bag, and a pair of Canadians return from a concert in California with more than a T-shirt.

With the biggest storm in centuries only a few days away, the truckers race for loads; Art and Todd set out to prove themselves.

An old map connected to testimony from an 1891 eyewitness account of Slumach's hanging sheds light on the legend.

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.

A Canadian wanted in Alberta is stopped en route to Ecuador; a parcel of baby food contains surprising ingredients.

A Russian dissident's complicated past raises questions for officers; a Korean tourist's resume and school diplomas raise eyebrows.

The Inland Enforcement Unit tracks a pair of Honduran drug runners; an American tourist seems to have already put down roots in Canada.

Trouble looms for a young Asian woman carrying someone else's bag, and a pair of Canadians return from a concert in California with more than a T-shirt.

Curly's deer hunt comes to a thrilling end with a shot gone awry; Sam, Troy and Terry struggle with uneven ground to build Troy a bathroom.

Eager to prove herself, Breanna splits from Oliver in search of deer; Terry helps Troy and Sarah while Squibb attacks Veronica's parking problem.

With big plans for the future, Oliver sets out to bring home some massive cedar trees that will help him turn his float house home into a kingdom.

Sam's desire to silence his generators ignites a fire that threatens to burn his house to the ground.

Squibb and Troy repair a sinking float that could cause a massive oil spill.

As the community of Port Protection springs forward, Squibb and Troy join forces to repair a sinking float that could cause a massive oil spill.

Sam's youngest son returns, as Veronica learns the basics.

Novice Veronica Arrants risks life and limb to repair the town phone line.

Novice Veronica Arrants risks life and limb to repair the town phone line.

New drug trafficking strategies include stashes anchored to the seabed and narco-submarines.

Novice Veronica Arrants risks life and limb to repair the town phone line.

Curly takes advantage of a break between storms to hunt for deer.

New drug trafficking strategies include stashes anchored to the seabed and narco-submarines.

Curly's deer hunt comes to a thrilling end with a shot gone awry; Sam, Troy and Terry struggle with uneven ground to build Troy a bathroom.

Eager to prove herself, Breanna splits from Oliver in search of deer; Terry helps Troy and Sarah while Squibb attacks Veronica's parking problem.

With big plans for the future, Oliver sets out to bring home some massive cedar trees that will help him turn his float house home into a kingdom.

Sam's desire to silence his generators ignites a fire that threatens to burn his house to the ground.

A street performer is caught in the middle of an escape act; a cheeky bus passenger answers questions about his mischievous past.

A distinctive bag has officers seeing double; a photographer misses the big picture; a heavily-modified truck causes concern.

A traveler's textbooks teach him an unexpected lesson; a tourist hits a snag instead of the slopes; officers inspect a shipment of cosmetics.

Officers add charges to a woman's lengthy rap sheet and stumble upon a hair-raising package from Malaysia.

The truckers race to deliver their loads while a massive storm approaches; Lisa and Art face a deadly shutdown; Darrell and Todd's feud threatens to rip team Polar apart.

A recurring mine marker points the team east to neighboring Harrison Lake as leads and legend line up; clues found in a 1950s article by an investigative reporter place a lost Spanish gold mine directly on Slumach's path.

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.

A street performer is caught in the middle of an escape act; a cheeky bus passenger answers questions about his mischievous past.

A distinctive bag has officers seeing double; a photographer misses the big picture; a heavily-modified truck causes concern.

A traveler's textbooks teach him an unexpected lesson; a tourist hits a snag instead of the slopes; officers inspect a shipment of cosmetics.

Officers add charges to a woman's lengthy rap sheet and stumble upon a hair-raising package from Malaysia.

Mariana explores the global surrogacy market to understand how the dream of starting a family is fueling a babies-for-cash black market.

Mariana tracks the illicit path of hashish from Morocco into Europe; a world of shadowy dealers, fast smuggling boats and endless wealth.

Health care costs have pushed millions of Americans to the black market.

Mariana goes inside the dangerous, high-stakes world of illegal gambling to try and understand its allure, its growth and its dark side.

Mariana heads to the Congo to investigate the illegal trading of wild apes that has apes on the brink of extinction.

The trafficking of human remains yields billions of dollars globally and remains clandestine; Mariana's investigation reveals the vulnerability of anyone to human remains trafficking.

Mariana heads to Mexico to investigate the billion-dollar business of people-smuggling to the U.S., a system fueled by cartels and corruption.

Mariana goes inside the world of contract killers.

US Airways Flight 1549 takes off from New York City's LaGuardia Airport when it collides with a flock of birds, destroying both engines.

Mariana delves into a new scheme called sextortion, where compromising photos are used to extort victims; while searching for the scammer who targeted a young American, she uncovers a scam culture even more terrifying than she had imagined.

Mariana goes inside the world of contract killers.

US Airways Flight 1549 takes off from New York City's LaGuardia Airport when it collides with a flock of birds, destroying both engines.

Mariana delves into a new scheme called sextortion, where compromising photos are used to extort victims; while searching for the scammer who targeted a young American, she uncovers a scam culture even more terrifying than she had imagined.

Mariana explores the global surrogacy market to understand how the dream of starting a family is fueling a babies-for-cash black market.

Mariana tracks the illicit path of hashish from Morocco into Europe; a world of shadowy dealers, fast smuggling boats and endless wealth.

Health care costs have pushed millions of Americans to the black market.

Mariana goes inside the dangerous, high-stakes world of illegal gambling to try and understand its allure, its growth and its dark side.

Officers are stumped by a backpacker carrying photos of his criminal activities; an American band gets caught in a jam.

Staff confront an American soldier running scared; a British woman causes confusion with her bag of tricks.

Hidden compartments in a traveler's backpack raise red flags; the discovery of a deadly weapon leaves mail center workers stunned.

Officers look for a message in a bottle; a lack of papers land a group of LA rappers in the doghouse; a young man receives a wake-up call.

A storm delivers deadly driving conditions as the truckers struggle to deliver their loads.

The source of Slumach's lost gold.

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.

Officers are stumped by a backpacker carrying photos of his criminal activities; an American band gets caught in a jam.

Staff confront an American soldier running scared; a British woman causes confusion with her bag of tricks.

Hidden compartments in a traveler's backpack raise red flags; the discovery of a deadly weapon leaves mail center workers stunned.

Officers look for a message in a bottle; a lack of papers land a group of LA rappers in the doghouse; a young man receives a wake-up call.

As spring begins, the next generation races to finish vital tasks.

The next generation must adapt to the ever-changing demands spring brings.

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.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

A lorry hits a safety net and overturns, so Thord and Bjørn have to work into the small hours to rescue the load of fresh salmon; in the north, Jo Roger has to rescue a lorry stuck in the snow.

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.

Thord Paulsen and his colleagues must fight against snow and icy winds as they rescue cars and trucks on Norway's slippery mountain roads.

A lorry hits a safety net and overturns, so Thord and Bjørn have to work into the small hours to rescue the load of fresh salmon; in the north, Jo Roger has to rescue a lorry stuck in the snow.

As spring begins, the next generation races to finish vital tasks.

The next generation must adapt to the ever-changing demands spring brings.

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.

An accidental detour leads two Canadians to a dead-end; an ornate frame holds more than just a picture; a man is suspected of money laundering.

An American traveler has trouble recalling his hazy past; bad decisions may keep a rugby player off the pitch; a bag is found in a restricted area.

A traveler's belongings raise repeated alarms; a man's reasons for studying in Canada may not be academic; an American couple make the move to Alaska.

A currency dog sniffs out thousands in undeclared cash; an aspiring actor can't keep track of the plot; officers arrest a wanted burglar.

Darrell and Todd try to get through record breaking snowfall, while the rest of the team fights to survive; despite frigid temperatures the war between VP Express and Polar reaches a boiling point.

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

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

An accidental detour leads two Canadians to a dead-end; an ornate frame holds more than just a picture; a man is suspected of money laundering.

An American traveler has trouble recalling his hazy past; bad decisions may keep a rugby player off the pitch; a bag is found in a restricted area.

A traveler's belongings raise repeated alarms; a man's reasons for studying in Canada may not be academic; an American couple make the move to Alaska.

A currency dog sniffs out thousands in undeclared cash; an aspiring actor can't keep track of the plot; officers arrest a wanted burglar.

Cesar rehabs an overexcited Australian shepherd and its emotional pet parent.

Cesar helps an aggressive beagle and a Malinois that refuse to leave home.

A pitbulls aggression is fueled by fear; a Frenchie eats everything.

Cesar helps a possessed pit mix and a miniature dachshund with a giant bark.

Cesar rehabilitates a German shepherd whose behavior is getting dangerous.

A couple with a baby seeks Cesar's help with a dog who bites and guards.

A Border Collie causes isolation and a Chihuahua bites the hand that feeds her.

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Orcas captivate with their intelligence and family structures; recent attacks on boats near Gibraltar raise questions, are they threatening us or just playing?

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Cesar rehabilitates a loud, anti-social Chihuahua and her inexperienced pet parents.

Orcas captivate with their intelligence and family structures; recent attacks on boats near Gibraltar raise questions, are they threatening us or just playing?

Cesar rehabs an overexcited Australian shepherd and its emotional pet parent.

Cesar helps an aggressive beagle and a Malinois that refuse to leave home.

A pitbulls aggression is fueled by fear; a Frenchie eats everything.

Cesar helps a possessed pit mix and a miniature dachshund with a giant bark.

An American's trip to Alaska heads south; officers suspect a convicted drug dealer is taking his business north; a ship containing weapons is searched.

Officers stop a father and son packing loads of ammo, but can't find the gun. Meanwhile, the Vessel Search Unit find a suspect sailor on a US tug.

A young man's lies could keep him from his fiancee, while the discovery of a gold bar and lots of cash spell trouble for another traveller.

Suspicions about a convicted smuggler uncover a scam; questions are raised when officers stumble upon a suitcase full of meat.

The truckers battle a massive storm.

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.

The Dawson City Fire Department struggles in the absence of their chief; Ray is stuck in deep snow on a remote backroad and Colin races against an incoming storm to keep the travelling public safe.

An American's trip to Alaska heads south; officers suspect a convicted drug dealer is taking his business north; a ship containing weapons is searched.

Officers stop a father and son packing loads of ammo, but can't find the gun. Meanwhile, the Vessel Search Unit find a suspect sailor on a US tug.

A young man's lies could keep him from his fiancee, while the discovery of a gold bar and lots of cash spell trouble for another traveller.

Suspicions about a convicted smuggler uncover a scam; questions are raised when officers stumble upon a suitcase full of meat.

Francis Drake is cemented in history as the world's most controversial pirate.

Grace O'Malley defies gender conventions of her day and becomes the most feared and respected leader of both the land and the sea, eventually rising to Chieftain.

Englishman-turned-Algerian pirate John Ward becomes ruler of the Tunisian empire.

Brilliant strategist Morgan takes humans, treasure, and towns without mercy.

Captain Kidd, the treasure hunter, turns from pirate hunter to pirate.

Blackbeard's name strikes fear into all as a brutal diabolical pirate.

Braver than the men, Anne Bonny and Mary Read are ferocious female pirates.

Bartholomew Roberts is the most successful pirate of the Golden Age.

HSI arrests human smugglers and discovers overcrowded and rundown stash houses in New Mexico; CBP extracts meth from shipped machinery in Miami.

Carl and Morgan attempt to move a thousand-pound sawmill to their property.

Bartholomew Roberts is the most successful pirate of the Golden Age.

HSI arrests human smugglers and discovers overcrowded and rundown stash houses in New Mexico; CBP extracts meth from shipped machinery in Miami.

Carl and Morgan attempt to move a thousand-pound sawmill to their property.

Francis Drake is cemented in history as the world's most controversial pirate.

Grace O'Malley defies gender conventions of her day and becomes the most feared and respected leader of both the land and the sea, eventually rising to Chieftain.

Englishman-turned-Algerian pirate John Ward becomes ruler of the Tunisian empire.

Brilliant strategist Morgan takes humans, treasure, and towns without mercy.

Hugh has a plan to crush the competition; Todd and Lisa are pressured to up their game.

With temperatures on the rise, conditions on the ice roads result in meltdown. The truckers from Polar and VP Express are pushed to the limit, crossing thin ice on their way to deliver critical loads.

With temperatures on the rise, conditions on the ice roads result in meltdown. The truckers from Polar and VP Express are pushed to the limit, crossing thin ice on their way to deliver critical loads.

Some engineering students carry out an unusual experiment; officers find a construction worker's story has no foundations.

With temperatures on the rise, conditions on the ice roads result in meltdown. The truckers from Polar and VP Express are pushed to the limit, crossing thin ice on their way to deliver critical loads.

The docs at Critter Fixer help their first capybara and an alpaca farm.

The docs at Critter Fixer move quickly to save a canine bitten by a snake.

The docs at Critter Fixer take Vet for a Day to the Zoo Atlanta.

The docs at Critter Fixer help a laboring bulldog and an aquatic axolotl.

The Docs at Critter Fixer return to FVSU as Homecoming Grand Marshals.

The docs at Critter Fixer rush to aid a big tortoise with a cracked shell.

The Docs at Critter Fixer strive to aid the animals of service members.

The docs at Critter Fixer exemplify treating both ends of the leash.

The Docs at Critter Fixer help a rescued wolf and deliver ten puppies.

The doctors at Critter Fixer attempt to outfit a duck with a prosthetic leg.

The doctors at Critter Fixer teach fish surgery at Tuskegee University.

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 doctors at Critter Fixer teach fish surgery at Tuskegee University.

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 help their first capybara and an alpaca farm.

The docs at Critter Fixer move quickly to save a canine bitten by a snake.

The docs at Critter Fixer take Vet for a Day to the Zoo Atlanta.

The docs at Critter Fixer help a laboring bulldog and an aquatic axolotl.

Lisa and Todd take on one of the toughest runs of the season; Darrell steals business from his former boss; Alex's trucking season is threatened by a crash.

Adam, Kru and Tony follow the path of a failed 1982 Vancouver news team led by a Slumach gold hunter and mystic dowser.

Lisa and Todd take on one of the toughest runs of the season; Darrell steals business from his former boss; Alex's trucking season is threatened by a crash.

Adam, Kru and Tony follow the path of a failed 1982 Vancouver news team led by a Slumach gold hunter and mystic dowser.

The Yukon's Civil Air Search and Rescue Association battles flying conditions in their search for a historic missing plane that had 44 people on board; the Dawson City Fire Department responds to a 911 call that puts the town in jeopardy.

Australia is home to weird and wonderful creatures that have evolved extraordinary adaptations due to being isolated from the rest of the world.

Australia's coastline is a true natural wonder, encompassing bountiful habitats where mesmerizing and surprising creatures reign supreme.

Dan O'Neil explores the strange world of animals that stop at nothing, including leveraging other creatures, to get ahead.

Dan O'Neil explores the weird and wonderful world of mutated animals that take over other animals, including a mind-controlling mushroom and a fish that turns into a set of testicles.

The most-famous witch trials of them all: Salem, Massachusetts.

The brutal Trier witch trials and the origins of witch-hunting.

The true story of the first major witch trials in Scotland.

Witch-hunters torture so-called witches during England's Civil War.