Experts and comics react to viral shark videos, along with pop-up facts.

Special edition pop-up facts and graphics reveal emerging shark attack hotspots.

Special edition pop-up facts and graphics aid research into surfing attacks.

With bonus content, ultra-athlete Ross Edgley pits himself against sharks.

How the giant megalodon shark took over the oceans.

Using a new experimental diving cage, two shark biologists investigate rising reports of bull sharks stealing from fishermen in northern Australia.

Shark attacks in the Red Sea as part of a trend worldwide.

Lisa and Todd struggle to complete their daring joint venture across the frozen Hudson Bay; Darrell braves the most torn up trail remaining on the winter roads; Art must face the last open ice crossing.

The zoo's oldest Tasmanian devil has a tumour; the vets take blood from a baby Kudu; Jahe finds a new toy.

Snow leopard comes from Halifax; an elk has a broken leg.

Lisa and Todd struggle to complete their daring joint venture across the frozen Hudson Bay; Darrell braves the most torn up trail remaining on the winter roads; Art must face the last open ice crossing.

The zoo's oldest Tasmanian devil has a tumour; the vets take blood from a baby Kudu; Jahe finds a new toy.

Snow leopard comes from Halifax; an elk has a broken leg.

The Pickers find mounds of treasure and steep prices on Vancouver Island; Scott and Sheldon devise a special purchasing strategy.

Interviews, outtakes and never-before-seen footage provide insight into the chaos and creativity behind the making of Steven Spielberg's legendary blockbuster "Jaws.".

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

Experts and comics react to viral shark videos, along with pop-up facts.

Experts investigate the first shark attacks ever recorded on Bali's coast.

Every October, shark attacks in Hawaii double; what's behind sharktober?

A series of attacks rocks the South Pacific paradise of New Caledonia.

Five shark attacks in just two summers scare South Carolinians.

Fresh pop-up facts and vivid graphics magnify a series of attacks in Australia.

Special edition pop-up facts and graphics aid research into surfing attacks.

Special pop-up facts and graphics unpack bull sharks in unexpected waters.

Special edition pop-up facts and graphics reveal emerging shark attack hotspots.

Interviews, outtakes and never-before-seen footage provide insight into the chaos and creativity behind the making of Steven Spielberg's legendary blockbuster "Jaws.".

Special edition pop-up facts and graphics reveal emerging shark attack hotspots.

Interviews, outtakes and never-before-seen footage provide insight into the chaos and creativity behind the making of Steven Spielberg's legendary blockbuster "Jaws.".

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

Experts and comics react to viral shark videos, along with pop-up facts.

Experts investigate the first shark attacks ever recorded on Bali's coast.

Every October, shark attacks in Hawaii double; what's behind sharktober?

A series of attacks rocks the South Pacific paradise of New Caledonia.

Five shark attacks in just two summers scare South Carolinians.

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

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.

Ken moves across Moose Creek in an effort to change his luck; tension grows as Bernie's junior crew makes mistakes; Karl's night crew slows him down.

During a ferry ride in Vancouver, Scott and Sheldon meet an Aboriginal artist with a bag of unique carvings.

David makes Ian the project leader for a rat-infested Jaguar; a rare Cadillac comes into Jay's shop; David's Bugatti threatens to embarrass him.

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

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.

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.

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.

Port Protection residents remain independent but no man stands alone.

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.

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.

Port Protection residents remain independent but no man stands alone.

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 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.

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

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.

A traveler must make a difficult decision; a bus passenger is busted with bud in her bag.

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

Cold weather threatens the miners' operations; Ken contemplates laying off half his crew; Karl's workers hunt moose after their sluice box ices over; Big Al battles beavers.

The guys meet the Tin King of Brantford and the Prince of Puppets in Peterborough; the guys hire a new employee and put him to work on a massive public sale of collected treasures.

The guys scramble to ready their Alpha Romeo and Delahaye for the Concours show in Pebble Beach, Calif.

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

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.

A traveler must make a difficult decision; a bus passenger is busted with bud in her bag.

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

Ranking history's 10 most dramatic global disasters.

Ten of history's worst maritime disasters at sea.

Explore the 10 most dramatic structural collapses in history, from bridges to buildings.

When a dam fails, catastrophe follows; history's 10 worst dam failures.

Exploring various catastrophies that has happened in mankind's quest to conquer space, from the Apollo 1 tragedy to the Challenger and the Columbia disasters.

Witness the 10 worst sports crashes from the high-risk world of sport racing.

Trains, planes, and ships collide; exploring ten global collisions.

Earhart, Everest and the Lost City of Z; uncovering the causes behind the top 10 tragic expeditions in history.

Awkwafina lost her mother at a young age; eager to help her reconnect with her South Korean culinary and ancestral heritage, Antoni curates a voyage of discovery filled with new experiences, family revelations, and evocative flavors.

Stanley Tucci revels in the culinary artistry of the picturesque region of Tuscany; the spirit of creativity is alive in the birthplace of the Renaissance.

Earhart, Everest and the Lost City of Z; uncovering the causes behind the top 10 tragic expeditions in history.

Awkwafina lost her mother at a young age; eager to help her reconnect with her South Korean culinary and ancestral heritage, Antoni curates a voyage of discovery filled with new experiences, family revelations, and evocative flavors.

Stanley Tucci revels in the culinary artistry of the picturesque region of Tuscany; the spirit of creativity is alive in the birthplace of the Renaissance.

Ranking history's 10 most dramatic global disasters.

Ten of history's worst maritime disasters at sea.

Explore the 10 most dramatic structural collapses in history, from bridges to buildings.

When a dam fails, catastrophe follows; history's 10 worst dam failures.

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

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.

The early arrival of winter forces Ken on a dangerous drive for fuel; Karl deals with a frozen sluice plant, a broken vehicle, and other assorted troubles; Bernie loses his pay streak and a crew member.

The Pickers encounter an obsessive collector of Coca-Cola memorabilia; examples of elegant American art glass command a high price.

Two mechanics butt heads; a Rat Rod rises from the junkyard; a new sheriff lays down the law.

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

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.

Alaskans confront brutal elements while on the hunt for critical resources.

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.

The final words of a lifelong gold hunter send Adam, Kru and Daryl Friesen through an icy gauntlet high above Pitt Lake.

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

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

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.

Alaskans confront brutal elements while on the hunt for critical resources.

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.

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

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.

Ken uncovers a mother lode of gold after he changes the Beast's location; breakdowns threaten to bring an early end to Bernie's season; Big Al selects a final site for his sluice plant.

The Pickers visit Armstrong, Abbotsford and Mission in British Columbia as they compete to see who can obtain the most manly item; trolley ads, tin litho signs and rare gas pumps are among the unique finds.

David travels to Northern Italy in search of rare Alfa Romeo parts; the owner of a Shelby Mustang GT350 makes a strange request.

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

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.

Dr. Pol and Diane celebrate a milestone that's been decades in the making.

Dr. Pol celebrates turning 80 with a trip to the Netherlands with Diane.

The Pols welcome a fluffy addition to the family; Tater is not pleased.

Welcome to the fair; Vets rally to keep dreams alive for hardworking kids.

Charles is worried about his dog Athena and looks to his dad for guidance.

From the North Pole to Dr. Pol, everyone is getting in the Christmas spirit.

The staffers become the clients when several of their pets fall ill.

The clinic works together to create an extra special surprise for Diane.

Paul Salopek, a National Geographic explorer and Pulitzer Prize winner, treks through the mountains of Yunnan in southwest China, to the neighbouring province of Sichuan with his Chinese partners.

Paul Salopek, a National Geographic explorer and Pulitzer Prize winner, treks through the mountains of Yunnan in southwest China, to the neighbouring province of Sichuan with his Chinese partners.

The Pols need to fix the sheep hut before winter arrives.

The clinic works together to create an extra special surprise for Diane.

Paul Salopek, a National Geographic explorer and Pulitzer Prize winner, treks through the mountains of Yunnan in southwest China, to the neighbouring province of Sichuan with his Chinese partners.

Paul Salopek, a National Geographic explorer and Pulitzer Prize winner, treks through the mountains of Yunnan in southwest China, to the neighbouring province of Sichuan with his Chinese partners.

The Pols need to fix the sheep hut before winter arrives.

Dr. Pol and Diane celebrate a milestone that's been decades in the making.

Dr. Pol celebrates turning 80 with a trip to the Netherlands with Diane.

The Pols welcome a fluffy addition to the family; Tater is not pleased.

Welcome to the fair; Vets rally to keep dreams alive for hardworking kids.

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

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.

Snow threatens to bury Ken's pay dirt; Karl ignores his father's advice; Big Al deals with failing equipment and unhappy workers as his first season comes to an end.

Searching for impressive finds in Winnipeg; Scott involves his two sons in the action.

David heads off to England to check out a royal barn; a dying man reveals his last wish.

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

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.

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.

The octopus is like an alien on Earth but with shapeshifting superpowers.

The secret of success is the extraordinary superpower of the octopus' mind.

Considered ultimate loners, octopuses are more sociable than ever imagined.

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.

Considered ultimate loners, octopuses are more sociable than ever imagined.

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.

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.

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.

Baby gorilla is nurtured; Rebeca is trained.

The baby gorilla goes back to holding; Zoofari debut; released fruit bat.

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.

Baby gorilla is nurtured; Rebeca is trained.

The baby gorilla goes back to holding; Zoofari debut; released fruit bat.

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

Dr. Oakley treats a sheep with a large growth and the eye of a tiny owl.

Dr. Oakley treats a pair of neglected dogs, and Willow rescues feral cats.

Dr. Oakley lassos a calf, shears an overgrown sheep and treats a dog with an eye injury.

Dr. Oakley treats an emaciated chicken and a dog with a lacerated paw.

Dr. Oakley treats a cherished breeding bull and a cat with a worrying lump.

Dr. Oakley lassos a calf, shears an overgrown sheep and treats a dog with an eye injury.

Dr. Oakley treats an emaciated chicken and a dog with a lacerated paw.

Dr. Oakley treats a cherished breeding bull and a cat with a worrying lump.

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.

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.

A camel's birthday celebration; Sumatran tiger; a seal fights for its life.

A mother gorilla is reintroduced after giving birth; the zoo's oldest animals; a seal is trained.

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.

A camel's birthday celebration; Sumatran tiger; a seal fights for its life.

A mother gorilla is reintroduced after giving birth; the zoo's oldest animals; a seal is trained.

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.

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.

A look at Sydney Airport's never-ending maintenance; featuring the changing of a wind sock, repairing a stuck airbridge and putting out a potentially catastrophic fire.

The busy Christmas season picks up, with thousands of families going on holiday, but the airport is shut down when an unidentified white powder is discovered on board an incoming flight.

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 busy Christmas season picks up, with thousands of families going on holiday, but the airport is shut down when an unidentified white powder is discovered on board an incoming flight.

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.

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.

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 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.

A new hire causes Ian to lose his cool; a Dodge Superbee gets a tune-up; an antique toy Packard is restored.

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.

Karl hopes to score 100 ounces of gold in one week; Ken must deal with an eager employee who keeps breaking equipment.

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 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.

HSI performs an undercover drug sting; CBP finds cocaine in Rio Grande Valley.

CBP's K9 sniffs out hidden cash; HSI intercepts a $2 million drug deal.

CBP in JFK and HSI in San Diego tackle fentanyl crisis on opposite coasts.

HSI Colombia chases illegal gold; CBP thwarts cartel activity in Texas.

HSI money laundering stings; CBP's largest drug seizure in LAX history.

HSI runs a human trafficking sting; CBP arrests a domestic terror suspect.

HSI surprises coke smugglers mid-handoff; CBP finds cash and ketamine.

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

After losing one of its own, Port Protection tries to move forward.

The Dutch Caribbean Coast Guard performs search and rescue operations.

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

After losing one of its own, Port Protection tries to move forward.

The Dutch Caribbean Coast Guard performs search and rescue operations.

HSI performs an undercover drug sting; CBP finds cocaine in Rio Grande Valley.

CBP's K9 sniffs out hidden cash; HSI intercepts a $2 million drug deal.

CBP in JFK and HSI in San Diego tackle fentanyl crisis on opposite coasts.

HSI Colombia chases illegal gold; CBP thwarts cartel activity in Texas.

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.

In the American border, agents questions an African traveler with a one-way ticket; in Detroit, a passenger receives a special surprise; officers wait for a drug-smuggler to expulse a pack of cocaine.

Jay struggles with a custom monster truck; David goes to England.

Darrell and Lisa head into Alberta and onto a trail nicknamed The Death Road; Art faces off with the ice crossing where he nearly lost his life last season; Todd takes rookie Steph Custance under his wing as she embarks on her first journey.

Karl contemplates a crew member's dismissal; fire threatens Cam's camp; Ken pours money into his operation.

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.

In the American border, agents questions an African traveler with a one-way ticket; in Detroit, a passenger receives a special surprise; officers wait for a drug-smuggler to expulse a pack of cocaine.

Mariana is on a mission to understand how personal and financial data is stolen and sold by a shadowy network of hackers and thieves.

Enhanced: Mariana follows the booming MDMA supply chain.

Violent crime is soaring in Los Angeles to levels not seen in 30 years; Mariana journeys into gangland to understand the violence plaguing LA.

Mariana embarks on a journey from Africa to the Middle East to investigate how illicit oil is fueling terrorist groups worldwide.

Mariana embeds with a crew of crypto scammers who show her how they make millions of dollars in mere weeks.

Mariana investigates underground fight clubs and the push to bring bare-knuckle fighting into the mainstream.

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