A forensic look at how crocodiles hunt wildebeest and zebra, with new perspectives on how these predators use ambush strategies and the element of surprise.

A forensic look at how cheetahs hunt prey, including lechwe, impala and wildebeest.

Puppies, a peahen and a miniature horse all get the Dr. Pol treatment.

Art Burke has to cross one of the longest winter roads in the world; Todd Dewey, must dig himself out of mountains of fresh snow or risk a dangerous night in freezing temperatures.

A mandrill monkey gets sick; walking with a new camel calf.

Keepers must contend with a crocodile while they round up turtles in the same pond; Kim tries to keep the giant pandas company.

Art Burke has to cross one of the longest winter roads in the world; Todd Dewey, must dig himself out of mountains of fresh snow or risk a dangerous night in freezing temperatures.

A mandrill monkey gets sick; walking with a new camel calf.

Keepers must contend with a crocodile while they round up turtles in the same pond; Kim tries to keep the giant pandas company.

Two macaques are being returned to their exhibit; rare turtle eggs; the newest baby koala must be hand fed.

Zoo vet tries to delay the transfer of Simon the tamandua to his new home; two koalas prepare for their move from San Diego to Toronto.

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.

A look into how the T-Rex became king of the dinosaurs.

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

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

The filmmakers use state-of-the-art technology to showcase an aerial journey across Europe and reveal things that are not easily seen from the ground.

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

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

The filmmakers use state-of-the-art technology to showcase an aerial journey across Europe and reveal things that are not easily seen from the ground.

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.

In Detroit airport, a family travelling from the UK, may need to corroborate their story. Also a tip from authorities, puts officers at the Chicago International Mail facility on high alert.

Border officers stop a young British visitor meeting an American cyber pal at Detroit Metro Airport, and a Chinese traveller is caught using his mobile phone in a secondary inspection in Chicago.

A strong odor leads to a secondary inspection for two Americans in Port Huron; an officer finds gold at Chicago's O'Hare Airport.

Authorities find a traveler's pot pipe in Blaine; in Port Huron, a traveler's past may come back to haunt him.

Stories found within the walls of the Royal Palace of Madrid include a swordsman who bested 17 challengers, a clock powered by witchcraft, and a 20th-century king who outsmarted a fascist.

The drivers are ready for what is forecast to be a cold and busy winter, but the tragic passing of legendary driver Darrell Ward leaves the drivers wondering who can take his place.

When the C-46 has a hydraulic fluid leak on the valley run, Jimmy is forced to crawl into the "hell hole.".

In Detroit airport, a family travelling from the UK, may need to corroborate their story. Also a tip from authorities, puts officers at the Chicago International Mail facility on high alert.

Border officers stop a young British visitor meeting an American cyber pal at Detroit Metro Airport, and a Chinese traveller is caught using his mobile phone in a secondary inspection in Chicago.

A strong odor leads to a secondary inspection for two Americans in Port Huron; an officer finds gold at Chicago's O'Hare Airport.

Authorities find a traveler's pot pipe in Blaine; in Port Huron, a traveler's past may come back to haunt him.

CBP seizes counterfeit medications, and HSI pursues a series of maritime smuggling cases.

HSI Miami catches a load of cocaine-filled fish; CBP San Diego fights human smuggling.

HSI busts a ketamine smuggler, while CBP uncovers ancient gold looted from Afghanistan.

AMO Puerto Rico sinks a marine smuggling op; HSI San Diego seals up a drug tunnel.

HSI busts a notorious dark web trafficker in France, while CPB finds fentanyl in Arizona.

AMO agents in Puerto Rico chase a fleeing boat carrying $2.5 million worth of cocaine.

CBP discovers abandoned fentanyl in Texas; HSI tracks an ecstasy package in Chicago.

HSI attempts a controlled delivery of meth in New York City, while CBP seizes party drugs in Florida.

Rookie CBP officers find multiple drugs; HSI runs a buy-bust operation.

CBP finds 142 kilos of coke worth over $7 million in a shipment of avocados in Florida.

HSI attempts a controlled delivery of meth in New York City, while CBP seizes party drugs in Florida.

Rookie CBP officers find multiple drugs; HSI runs a buy-bust operation.

CBP finds 142 kilos of coke worth over $7 million in a shipment of avocados in Florida.

CBP seizes counterfeit medications, and HSI pursues a series of maritime smuggling cases.

HSI Miami catches a load of cocaine-filled fish; CBP San Diego fights human smuggling.

HSI busts a ketamine smuggler, while CBP uncovers ancient gold looted from Afghanistan.

AMO Puerto Rico sinks a marine smuggling op; HSI San Diego seals up a drug tunnel.

A Canadian must deliver the truth before visiting his wife and child; an officer finds a skull at the JFK mail facility.

A Ukrainian traveler may split after divorcing her husband; a suspicious package is sent to the lab for narcotics testing.

A Canadian is interviewed after officers find pictures of pot plants on his phone; a canine team detects marijuana on a couple.

A conductor arrives to lead a symphony orchestra; a drug dealer tries to enter the United States.

The Jewish origins of Mr. Spock; creating Cleopatra's perfume; new view of the Crucifixion; the tomb of Mary.

Lisa Kelly finds herself in a real jam after jackknifing her truck deep in the back-country; Alex Debogorski gets more than he bargained for when he falls through a patch of thin ice; Todd Dewey comes to the aid of a stranded trucker.

An outsider comes in to whip Buffalo into shape; Gord and Sean's DC-3 delivery goes awry.

A Canadian must deliver the truth before visiting his wife and child; an officer finds a skull at the JFK mail facility.

A Ukrainian traveler may split after divorcing her husband; a suspicious package is sent to the lab for narcotics testing.

A Canadian is interviewed after officers find pictures of pot plants on his phone; a canine team detects marijuana on a couple.

A conductor arrives to lead a symphony orchestra; a drug dealer tries to enter the United States.

Mariana exposes a racist underground movement bent on a violent future.

Mariana follows a meth pipeline from Mexican cartels to American users.

Mariana tracks a smuggling route of stolen cars from the U.S. to West Africa.

Mariana meets the villains behind an exploding online romance scam.

Mariana investigates a new breed of cocaine trafficker: lady bosses.

Mariana investigates the criminals destroying the Amazon rainforest.

Mariana explores the billion-dollar underworld of illegal fishing.

Mariana investigates the illicit trade in human organs.

The making of the greatest structures and machines ever created.

CBP saves sacred African artifacts and finds a mega shipment of meth at LAX.

Mariana investigates the illicit trade in human organs.

The making of the greatest structures and machines ever created.

CBP saves sacred African artifacts and finds a mega shipment of meth at LAX.

Mariana exposes a racist underground movement bent on a violent future.

Mariana follows a meth pipeline from Mexican cartels to American users.

Mariana tracks a smuggling route of stolen cars from the U.S. to West Africa.

Mariana meets the villains behind an exploding online romance scam.

CBP worries a man from Nicaragua may not leave the U.S.; a traveler's plan to start an e-vape business may go up in smoke.

An American returning from the Dominican Republic brings an unusual item; an unknown substance is tested.

Officers find cocaine inside a Caribbean cocktail; officers sift through packages of pills.

Real estate entrepreneurs are questioned; a traveler's investments in the U.S. raises alarms; suspicious Mexican souvenirs.

Stories from the Uffizi Gallery in Florence, Italy, include the killing of a 15th-century godfather, the disappearance of a famous artist, a lucky wild boar and a poisoned alchemist.

A sudden warm-up threatens to derail the ice road season; Art Burke faces scary and slick roads; Lisa Kelly is forced to ask her former boss for financial help; Alex Debogorski encounters a mystery man walking alone on an isolated winter road.

Buffalo re-enacts a WWII bombing in a DC-4; Devan discovers a hole in the C-46 mid-flight.

CBP worries a man from Nicaragua may not leave the U.S.; a traveler's plan to start an e-vape business may go up in smoke.

An American returning from the Dominican Republic brings an unusual item; an unknown substance is tested.

Officers find cocaine inside a Caribbean cocktail; officers sift through packages of pills.

Real estate entrepreneurs are questioned; a traveler's investments in the U.S. raises alarms; suspicious Mexican souvenirs.

When the sun doesn't set, Alaska natives forgo sleep to seize the daylight.

Alaska Natives work with family to uphold traditions of their ancestors.

Alaska Natives use long summer days for harvests and projects.

The younger generation of Alaska Natives step up to new challenges.

Alaska Natives train the next generation to provide from the land.

Alaskan Native families carry on their traditional ways on their homelands.

Alaska Natives work to rebuild after an unprecedented storm surge floods and devastates coastal villages.

An approaching Alaskan winter blurs the line between predator and prey.

Ben and Louise are inundated with a high volume of calls in a short period of time. On their first location, they come across two lethal snakes.

Wildlife activists Benhail Antao and Louise Remedios set out on a nerve-wracking mission to catch a deadly Indian krait.

Tommy Thompson fails to appear in court, and the search begins.

An approaching Alaskan winter blurs the line between predator and prey.

Ben and Louise are inundated with a high volume of calls in a short period of time. On their first location, they come across two lethal snakes.

Wildlife activists Benhail Antao and Louise Remedios set out on a nerve-wracking mission to catch a deadly Indian krait.

Tommy Thompson fails to appear in court, and the search begins.

When the sun doesn't set, Alaska natives forgo sleep to seize the daylight.

Alaska Natives work with family to uphold traditions of their ancestors.

Alaska Natives use long summer days for harvests and projects.

The younger generation of Alaska Natives step up to new challenges.

A traveler is caught driving without a license; a U.S. resident returns from the Dominican Republic.

Human bones are found inside luggage; a pair fails to declare thousands of dollars in jewelry; a mysterious powder is masked by beauty products.

A traveler is caught with injections; officers smoke out marijuana residue; a mom may end up in jail due to a wrong turn.

A one-way ticket raises red flags; a traveler is caught with undeclared meat; officers find a loaded gun and live crab.

Moscow's State Historical Museum holds such artifacts as Lenin's Rolls-Royce; the shame of Napoleon's army; Ivan the Terrible's torture chamber.

A blast of arctic air reopens the ice roads; Steph Custance falls victim to severe icing and winds up in a ditch; truckers set out to see if the newly reopened ice crossings are really ready for their big rigs.

Chuck quits due to all the drama and Joe clashes with maintenance when a sale is delayed.

A traveler is caught driving without a license; a U.S. resident returns from the Dominican Republic.

Human bones are found inside luggage; a pair fails to declare thousands of dollars in jewelry; a mysterious powder is masked by beauty products.

A traveler is caught with injections; officers smoke out marijuana residue; a mom may end up in jail due to a wrong turn.

A one-way ticket raises red flags; a traveler is caught with undeclared meat; officers find a loaded gun and live crab.

Dr. Oakley has many patients with big personalities who aren't afraid to talk back.

Sometimes Dr. Oakley has to take a bull, or yak, by the horns to get things done.

Dr. Oakley isn't afraid to roll up her sleeves, even when things get messy.

For Dr. Oakley's clients, their pets are more than animals; they're family.

It's all hands on deck as Dr. Michelle Oakley treats canines of all kinds.

In Alaska, winter conditions are tough, but Dr. Michelle Oakley is tougher.

Take a special trip down memory lane, as the entire Oakley family cares for the animals of the Yukon.

In this enhanced episode, the fair is a family tradition for generations.

With extra scenes - the most confused Goldendoodle of Cesars career.

Cesar helps a rottweiler on house arrest and a Pom Terrier to socialize.

In this enhanced episode, the fair is a family tradition for generations.

With extra scenes - the most confused Goldendoodle of Cesars career.

Cesar helps a rottweiler on house arrest and a Pom Terrier to socialize.

Dr. Oakley has many patients with big personalities who aren't afraid to talk back.

Sometimes Dr. Oakley has to take a bull, or yak, by the horns to get things done.

Dr. Oakley isn't afraid to roll up her sleeves, even when things get messy.

For Dr. Oakley's clients, their pets are more than animals; they're family.

Officers find white powder in tea sacks; pills marked ICE are frozen; some furry foreigners arrive to spread good will.

A traveler is caught with cocaine-filled pen caps; a long stay alerts CBP; a probation-breaking welder feels the heat.

A fake ID is comes to light at the border; a young traveler's stories don't jibe; CBP hounds sniff out forbidden food.

Officers find a stash of luxury knockoffs; a drag race fan slows his roll; CBP catches a wanted duo.

Treasures found at the Smithsonian Institution include Zero fighter planes, details for a mission to Mars, a Harley-Davidson motorcycle and a star-spangled banner.

Polar Industries must deliver an oversized load hundreds of miles north on the winter roads; owner Mark Koyhaykewych recruits Lisa Kelly, then calls in Reno Ward, the 23-year-old son of the late Darrell Ward; a blizzard adds a new layer of danger.

Duane begs Chuck to come back when a gasoline shortage happens in Yellowknife.

Officers find white powder in tea sacks; pills marked ICE are frozen; some furry foreigners arrive to spread good will.

A traveler is caught with cocaine-filled pen caps; a long stay alerts CBP; a probation-breaking welder feels the heat.

A fake ID is comes to light at the border; a young traveler's stories don't jibe; CBP hounds sniff out forbidden food.

Officers find a stash of luxury knockoffs; a drag race fan slows his roll; CBP catches a wanted duo.

Archaeologists unearth new evidence of how the iconic pyramids evolved.

Archaeologists investigate the suspicious death of Tutankhamun.

Archaeologists investigate how the river Nile transformed ancient Egypt.

Archaeologists investigate Egypt's famous warrior king, Alexander the Great.

Hunting Egypt's lost treasures in the Valley of the Kings.

In the shadow of the Great Pyramid, archaeologists unearth a royal palace.

Archeologists excavate an unexplored burial chamber inside a pyramid.

A dog scares a bear; a baboon steals a snack; a puppy rides a vacuum.

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

An okapi is born, a raven shines on stage, and a mandrill finds a new home.

A dog scares a bear; a baboon steals a snack; a puppy rides a vacuum.

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

An okapi is born, a raven shines on stage, and a mandrill finds a new home.

Archaeologists unearth new evidence of how the iconic pyramids evolved.

Archaeologists investigate the suspicious death of Tutankhamun.

Archaeologists investigate how the river Nile transformed ancient Egypt.

Archaeologists investigate Egypt's famous warrior king, Alexander the Great.

A small convoy heads out with an oversized load; Lisa Kelly and Reno Ward's skills are tested by the treacherous journey; Art Burke attempts to navigate an ice road over a frozen lake; Alex Debogorski stops to help a stranded trucker.

Warthog mom is anything but friendly to her four tiny newborns.

Carefully catching and holding a dozen muscular kangaroos.

A small convoy heads out with an oversized load; Lisa Kelly and Reno Ward's skills are tested by the treacherous journey; Art Burke attempts to navigate an ice road over a frozen lake; Alex Debogorski stops to help a stranded trucker.

Warthog mom is anything but friendly to her four tiny newborns.

Carefully catching and holding a dozen muscular kangaroos.

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.

Cesar helps an excited pit bull and matches a family with their forever dog.

Cesar works with a confused Goldendoodle and a fearful pet parent.

Cesar's rehab of two violent dogs threatening to kill each other continues.

Cesar finds a perfect dog for a single mom and helps a biting mini pinscher.

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.

The vets swing into action mending paws, jaws, and a down on his luck duck.

A giraffe X-ray; painted dog pack checkup; an adorable flamingo chick.

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

The vets swing into action mending paws, jaws, and a down on his luck duck.

A giraffe X-ray; painted dog pack checkup; an adorable flamingo chick.

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.

Cesar works with a confused Goldendoodle and a fearful pet parent.

Cesar works with a confused Goldendoodle and a fearful pet parent.

Reno Ward has a disastrous encounter with a speeding pick-up truck; Lisa Kelly attempts to rescue Reno but is forced to leave him to fend for himself; Art Burke attempts to deliver a Zamboni to save an isolated community's hockey season.

Orangutans get new play toys; a dwarf crocodile is ailing.

Birth of a fragile muntjac fawn; training the elephants.

Reno Ward has a disastrous encounter with a speeding pick-up truck; Lisa Kelly attempts to rescue Reno but is forced to leave him to fend for himself; Art Burke attempts to deliver a Zamboni to save an isolated community's hockey season.

Orangutans get new play toys; a dwarf crocodile is ailing.

Birth of a fragile muntjac fawn; training the elephants.

Vet Tech Jen hand-nurses a newborn fawn; three cheetahs arrive for breeding.

A llama is in trouble; sibling rivalry between two barbary apes.

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.

Rising temperatures and worsening droughts cause apocalyptic dust storms that endanger the world's food supply; Bill goes back in time to the 1930s Dust Bowl and demonstrates how to avoid repeating that dark chapter of history.

Time runs out for humanity when comets slam into Earth; Bill ventures to the outer reaches of the solar system to reveal where comets formed billions of years ago, demonstrating how to detect and deflect them before disaster strikes.

The mother of all catastrophes unleashes earthquakes, tsunamis and volcanic eruptions on the same day, wreaking havoc across five continents; Bill explains why Earth is so dangerous and how destructive forces make life possible on the planet.

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

The filmmakers use state-of-the-art technology to showcase an aerial journey across Europe and reveal things that are not easily seen from the ground.

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

The filmmakers use state-of-the-art technology to showcase an aerial journey across Europe and reveal things that are not easily seen from the ground.

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.

A car's radiation levels alert CBP; an officer digs up a stash of deadly bath salts; multiple phones materialize.

CBP converges on flights arriving from drug-source countries; a coffee expo volunteer finds trouble; pills are found in film containers.

A faceoff develops over luxury counterfeits; agents detect potentially lethal powder; a CBP beagle finds the mother load of meat.

Suspected of smuggling narcotics, a jittery traveler's next stop is a medical facility; a pair arrives bearing a trophy; CBP question a DJ's find.

A big bump takes out Art Burke's radiator; Todd Dewey's rig lands in a snowbank; Steph Custance regrets her foray onto a wet ice crossing; Alex Debogorski uses a sled to drag a construction shack across a frozen lake.

The Palace of Versailles in France reveals stories of a fallen musketeer, the schemes of Marie Antoinette, the murder of a king's mistress, and the origin of human life.

Duane lands a huge contract; Adam must work without Chuck.

A car's radiation levels alert CBP; an officer digs up a stash of deadly bath salts; multiple phones materialize.

CBP converges on flights arriving from drug-source countries; a coffee expo volunteer finds trouble; pills are found in film containers.

A faceoff develops over luxury counterfeits; agents detect potentially lethal powder; a CBP beagle finds the mother load of meat.

Suspected of smuggling narcotics, a jittery traveler's next stop is a medical facility; a pair arrives bearing a trophy; CBP question a DJ's find.

CBP finds an SUV loaded with meth; AMO seizes nearly 2000 kilos of cocaine.

CBP seizes $500K worth of coke; HSI arrests an importer of illegal pills.

CBP and HSI track 25,000 ecstasy pills bound for Philadelphia from Germany.

CBP finds 100 kilos of coke in a banana shipment bound for a Philly bodega.

CBP detains a man suspected of swallowing drugs; AMO agents find $51 million of coke.

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

SD HSI follows a loaded car; CBP and HSI test out a drug detection device.

Customs and Border Protection finds $1 million of cocaine in a cargo truck; Homeland Security Investigations cracks down on a date rape drug.

HSI finds overcrowded human stash houses; CBP discovers meth in machinery.

An HSI stakeout leads to nearly $500,000 of meth and fentanyl in San Diego; CBP finds concealed cash and a carload of cocaine at the El Paso border.

Customs and Border Protection finds $1 million of cocaine in a cargo truck; Homeland Security Investigations cracks down on a date rape drug.

HSI finds overcrowded human stash houses; CBP discovers meth in machinery.

An HSI stakeout leads to nearly $500,000 of meth and fentanyl in San Diego; CBP finds concealed cash and a carload of cocaine at the El Paso border.

CBP finds an SUV loaded with meth; AMO seizes nearly 2000 kilos of cocaine.

CBP seizes $500K worth of coke; HSI arrests an importer of illegal pills.

CBP and HSI track 25,000 ecstasy pills bound for Philadelphia from Germany.

CBP finds 100 kilos of coke in a banana shipment bound for a Philly bodega.

A tourist's uncertain vacation plans make him suspicious; two backpackers return with more than just memories; in Port Huron, a traveler carries a concealed weapon.

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

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

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

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.

Stories from London's National Maritime Museum include the shooting of Admiral Horatio Nelson, the capture of pirates, Captain Bligh's commandeering of a lifeboat and lightning strikes at sea.

Adam and Duane are forced to work things out on a flight to Alert, Earth's northernmost settlement.

A tourist's uncertain vacation plans make him suspicious; two backpackers return with more than just memories; in Port Huron, a traveler carries a concealed weapon.

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

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

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

Mariana exposes the dangers of the growing and deadly ghost guns industry.

Mariana investigates the lucrative black market for private data.

Enhanced: Mariana follows the booming MDMA supply chain.

Mariana journeys into gangland to understand the violence plaguing LA.

Mariana investigates how illicit oil is fueling terrorist groups worldwide.

Mariana embeds with crypto scammers who show her how they make millions.