Investigators examine the reason behind the deadly crash of Air France Flight 447 that took a catastrophic dive into the Atlantic Ocean.

The security team has its hands full with a fare dodger.

Survivors of the 2009 Turkish Airlines Flight 1951 crash share their firsthand experiences from that fateful day.

Lion Air Flight 610 was just 13 minutes into flight from Jakarta, Indonesia, when it plunges into the sea on October 29, 2018.

The 1985 Japan Airlines Boeing 747 crash is the deadliest single-aircraft accident in history, with 520 fatalities out of 524 people on board.

Curious minds discover how the British Midland Flight 92 crashes on a freeway embankment near the village of Kegworth, resulting in tragedy.

Pakistan International Airlines Flight 8303 crashes near Karachi on 22 May 2020, minutes from landing. The Airbus A320 collides with a residential area during a second approach, just miles from the runway.

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.

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.

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.

Glass brought light into homes and put the world into focus; people use glass to protect ourselves, cure disease, and create artistic masterpieces.

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 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.

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.

The "Mothman" terrorizes a town; an unidentified sea creature; attacks by the "monkey man.".

A tricky rescue of an excavator forces Thord to find solutions, but he's in double trouble when rookie Terje messes up.

When a salmon truck crashes into a ditch, it kicks off a night of havoc for Thord; with truck drivers in trouble all over his territory, Thord's team is pushed to the limit.

Thord pits his life against speeding traffic to rescue a stranded truck.

Wild weather and traffic convoys cause carnage on Thord's mountain.

Thord takes tow truck driver, Erlend, along to rescue a crashed van near a graveyard at night; they end up spooked while trying to pull the van up the ice-covered slope of a 20 degree hill.

There is chaos on the main road after a truck driver skids on ice but refuses help from Thord; another vehicle runs into serious trouble and needs urgent rescue.

In deep snow, Thord gets stressed when a winch failure threatens a rescue.

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

The rescue operation is a tricky one as the truck in question is on the verge of tipping; Thord decides to entrust Bjorn with his life and crawls under the trailer during the pull.

In deep snow, Thord gets stressed when a winch failure threatens a rescue.

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

The rescue operation is a tricky one as the truck in question is on the verge of tipping; Thord decides to entrust Bjorn with his life and crawls under the trailer during the pull.

A tricky rescue of an excavator forces Thord to find solutions, but he's in double trouble when rookie Terje messes up.

When a salmon truck crashes into a ditch, it kicks off a night of havoc for Thord; with truck drivers in trouble all over his territory, Thord's team is pushed to the limit.

Thord pits his life against speeding traffic to rescue a stranded truck.

Wild weather and traffic convoys cause carnage on Thord's mountain.

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

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.

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.

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.

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.

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

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 huge cataclysm is discovered in ancient texts; an alien discovery; a sinister robot takeover.

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.

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

A young zebra undergoes urgent abdominal surgery after an encounter with an eland's horn; two meerkats jostle for top position in the meerkat mob.

Dive into the truth behind clips of sharks, whales and sea snakes and other underwater animal encounters.

Everything feels connected as the vets see patterns emerge in their cases.

A young zebra undergoes urgent abdominal surgery after an encounter with an eland's horn; two meerkats jostle for top position in the meerkat mob.

Dive into the truth behind clips of sharks, whales and sea snakes and other underwater animal encounters.

Everything feels connected as the vets see patterns emerge in their cases.

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.

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

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

Strange beetles and butterflies are mailed into Canada that may carry disease.

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

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.

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.

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.

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

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

Strange beetles and butterflies are mailed into Canada that may carry disease.

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

Mysterious human-shaped shadow; a little boy travels hundreds of miles in a second; crystal skulls.

Reconstructing the WWII battle in the skies over Britain, the hunt for the deadly Nazi U-boats, the parachute drop at Arnhem, the Allies' bloody struggle through Normandy, the showdown at the Italian Abbey of Montecassino, and the fight for Poland.

The longest campaign of the war pits the deadly stealth of the Nazi U-boats against the code-breaking genius and long-range bombers of the Allies.

Just weeks before the war ends, USS Indianapolis is violently sunk; hundreds of men are lost at sea as they fight off exposure and shark attacks; it is the worst disaster at sea in U.S. Naval history.

Undersea explorers aboard the research vessel Petrel detect a wreck off the coast of the Philippines that fits the profile of an American destroyer.

Hours after emerging victorious in the first carrier-to-carrier battle of World War II, the USS Lexington erupts in flames due to enemy fire; after 80 years, Petrel hopes to spot the wreck and the planes that went down with the ship.

The Petrel team searches for the American aircraft carrier USS Hornet; the ship's life is cut short when the Hornet sails into a hornet's nest of Japanese ships.

What happened aboard the USS Juneau; five brothers are lost, but not all perish when the ship goes down; at least one brother is among scores of men stranded at sea for eight days.

According to the World Happiness Report, Ghana's capital city of Accra is the fourth most optimistic place on earth; Rainn explores how boxing, fishing, farming and burying dead people in coffins shaped like condoms can relate to happiness.

Bertie searches the islands of Indonesia for an elusive devil ray.

What happened aboard the USS Juneau; five brothers are lost, but not all perish when the ship goes down; at least one brother is among scores of men stranded at sea for eight days.

According to the World Happiness Report, Ghana's capital city of Accra is the fourth most optimistic place on earth; Rainn explores how boxing, fishing, farming and burying dead people in coffins shaped like condoms can relate to happiness.

Bertie searches the islands of Indonesia for an elusive devil ray.

Reconstructing the WWII battle in the skies over Britain, the hunt for the deadly Nazi U-boats, the parachute drop at Arnhem, the Allies' bloody struggle through Normandy, the showdown at the Italian Abbey of Montecassino, and the fight for Poland.

The longest campaign of the war pits the deadly stealth of the Nazi U-boats against the code-breaking genius and long-range bombers of the Allies.

Just weeks before the war ends, USS Indianapolis is violently sunk; hundreds of men are lost at sea as they fight off exposure and shark attacks; it is the worst disaster at sea in U.S. Naval history.

Undersea explorers aboard the research vessel Petrel detect a wreck off the coast of the Philippines that fits the profile of an American destroyer.

Rookie Steph Custance tries to complete the first ice road mission of her career; Alex Debogorski runs into a road block as temperatures soar; Art Burke attempts to deliver to a new community; Darrell Ward braves an unregulated winter road.

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.

Rookie Steph Custance tries to complete the first ice road mission of her career; Alex Debogorski runs into a road block as temperatures soar; Art Burke attempts to deliver to a new community; Darrell Ward braves an unregulated winter road.

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.

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

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 team investigates a string of shark attacks in Australia.

The team investigates an attack on a foil boarder in Australia to find what stimulates an attack; the team meet with hydrodynamic experts.

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

The team investigates a string of shark attacks in Australia.

The team investigates an attack on a foil boarder in Australia to find what stimulates an attack; the team meet with hydrodynamic experts.

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.

Darrell Ward faces a trail known as "the obstacle course"; Todd Dewey strives to clear a melting ice bridge; Alex Debogorski hauls an oversized fuel tank; Art Burke stumbles onto an ice crossing in the middle of the night.

An avalanche risk forces a bombing mission above the Klondike Highway.

Darrell Ward faces a trail known as "the obstacle course"; Todd Dewey strives to clear a melting ice bridge; Alex Debogorski hauls an oversized fuel tank; Art Burke stumbles onto an ice crossing in the middle of the night.

An avalanche risk forces a bombing mission above the Klondike Highway.

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

Recounting the life of Chinggis Khan, beginning with the struggles of his early years, including his family's fall from power, his survival against rival tribes and his first alliances as a young warrior to rescue his kidnapped wife Borte.

Temujin's powers grow as he battles with Jamuqa; he is exiled, but he returns to unify the Mongol tribes when he takes the title of Chinggis Khan.

Genghis Khan built power by building an army and eliminating rivals; he began conquests against the Tanguts and the Jin, expanding his empire.

When the neighboring empire attacks a Mongol caravan and Genghis Khan's envoys, he unleashes a campaign that annihilates the empire and solidifies Mongol dominance in Persia; he names his son Ogedei as his successor before his death.

Ogedei is proclaimed ruler of the Mongol Empire; he conquers Armenia, Georgia and the Jin Empire and builds the capital city of Karakorum.

Ogedei's death triggers a struggle for succession over the largest empire in the world.

Gary Mehigan, an Australian chef, travels to Brajbhumi to witness the grand, vibrant and unique celebration of Holi as he engages in a series of activities.

Gary immerses himself in Kerala's 10-day celebrations of Onam, an annual harvest and cultural festival, by participating in exciting activities and sampling local cuisine.

Chef Pablo tags along thousands of devotees as they perform rituals and distribute sweets to celebrate the Ganpati Festival, which is dedicated to Lord Ganesh.

Gary Mehigan explores different parts of Delhi and Hyderabad during Eid al-Fitr, where Muslims celebrate the end of Ramadan with delicacies.

Ben Horton explores Guizhou's mystical wilderness, iconic attractions and hidden marvels.

Gary Mehigan explores different parts of Delhi and Hyderabad during Eid al-Fitr, where Muslims celebrate the end of Ramadan with delicacies.

Ben Horton explores Guizhou's mystical wilderness, iconic attractions and hidden marvels.

When the neighboring empire attacks a Mongol caravan and Genghis Khan's envoys, he unleashes a campaign that annihilates the empire and solidifies Mongol dominance in Persia; he names his son Ogedei as his successor before his death.

Ogedei is proclaimed ruler of the Mongol Empire; he conquers Armenia, Georgia and the Jin Empire and builds the capital city of Karakorum.

Ogedei's death triggers a struggle for succession over the largest empire in the world.

Gary Mehigan, an Australian chef, travels to Brajbhumi to witness the grand, vibrant and unique celebration of Holi as he engages in a series of activities.

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

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

Following Australian Customs and Border Protection officers as they attempt to enforce the country's various quarantine, customs, immigration, and finance laws.

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

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.

Harsh flying conditions threaten the search for a historic missing plane.

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.

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

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

Following Australian Customs and Border Protection officers as they attempt to enforce the country's various quarantine, customs, immigration, and finance laws.

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

An earth-shattering boom; a paranormal fog on Lake Michigan; a blinding double flash of light.

The villagers of Port Protection are back to paving with good intentions.

Curly shoots a bear; Troy and Sarah struggle with a new water system.

Residents tackle tasks at the height of summer's season of productivity.

All around Port Protection, neighbors lend each other helping hands.

Port Protection's canine community takes center stage.

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

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.

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

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

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.

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

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

The villagers of Port Protection are back to paving with good intentions.

Curly shoots a bear; Troy and Sarah struggle with a new water system.

Residents tackle tasks at the height of summer's season of productivity.

All around Port Protection, neighbors lend each other helping hands.

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.

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.

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.

Devastating flash floods threaten Dawson City.

The source of Slumach's lost gold.

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.

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.

Stories about parallel dimensions.

The airport faces a blackout and a plane has to turn back shortly after take-off with a reported faulty engine.

High-speed bombing tests raise doubts about one student's place in the course.

Aircraft carrier landing is a technical test for the students.

The students start the dogfighting phase to learn how to attack.

Defensive dogfighting proves a tough test, as instructors go for the kill.

With the finish line in sight, the students face their final and big test, as they go head-to-head in a dogfight against an instructor.

The remaining students must dogfight an instructor to earn their wings; past failures mean it's their last chance to get it right.

An explosion of an old railway bridge shakes the station; officers help a woman who fell on an escalator.

Brad has just 90 minutes to turn around an Air India flight; a kangaroo keeps Trent on his toes and baggage handler Brodie battles jams.

The remaining students must dogfight an instructor to earn their wings; past failures mean it's their last chance to get it right.

An explosion of an old railway bridge shakes the station; officers help a woman who fell on an escalator.

Brad has just 90 minutes to turn around an Air India flight; a kangaroo keeps Trent on his toes and baggage handler Brodie battles jams.

The airport faces a blackout and a plane has to turn back shortly after take-off with a reported faulty engine.

High-speed bombing tests raise doubts about one student's place in the course.

Aircraft carrier landing is a technical test for the students.

The students start the dogfighting phase to learn how to attack.

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.

A musician claims to have special powers that help her see the future.

A father and son from China have four suitcases full of undeclared food; an immigration raid targets illegal workers.

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.

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

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

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.

A musician claims to have special powers that help her see the future.

A father and son from China have four suitcases full of undeclared food; an immigration raid targets illegal workers.

Stories of the human body reaching beyond the limits of modern medicine.

Thord faces a deadly descent and Jo Roger takes on a triple mission.

When Thord and Bjoern team up for a big truck rescue, they disagree on the best approach, and up north, Ole Henrik has a lot to prove.

Thord is forced to test his new rotator truck when the tractor crashes down a hill and lands on its roof; in the north, Raido is on his way to save a school bus that has fallen into a ditch; car-crazy Björn is met with an electric car.

Thord is busy rescuing two crashed trucks, so when he gets a call about a group of teenagers who've skidded off the road, he sends his daughter Malin.

In a storm, Thord takes on a truck driver who refuses rescue and an incompetent apprentice.

Jo Roger gets unexpected help on a big mission; Thord risks crushing a snow-covered car when rescuing a tanker from a tight spot.

When a landslide takes out an excavator, Thord and Bjorn face a 12-day challenge.

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

Bjoern plans a high-risk rescue when an overturned tanker blocks the road. He needs Thord's help, but Thord's busy with a challenge of his own.

When a landslide takes out an excavator, Thord and Bjorn face a 12-day challenge.

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

Bjoern plans a high-risk rescue when an overturned tanker blocks the road. He needs Thord's help, but Thord's busy with a challenge of his own.

Thord faces a deadly descent and Jo Roger takes on a triple mission.

When Thord and Bjoern team up for a big truck rescue, they disagree on the best approach, and up north, Ole Henrik has a lot to prove.

Thord is forced to test his new rotator truck when the tractor crashes down a hill and lands on its roof; in the north, Raido is on his way to save a school bus that has fallen into a ditch; car-crazy Björn is met with an electric car.

Thord is busy rescuing two crashed trucks, so when he gets a call about a group of teenagers who've skidded off the road, he sends his daughter Malin.

An American tourist is caught renting by the hour, but insists she needs to meet up with her boyfriend.

At O'Hare International, a returning American's bananas cause a slip-up in secondary; a mother covers for her kid at Detroit's Ambassador Bridge; a car search is brought to a head in Washington State.

Officers search for a fugitive in Washington State; a cook is questioned on his way to Las Vegas; a canine flags several packages in Chicago; x-rays discover anomalies in Port Huron cargo.

An officer's expertise in body language pays off; a German rock band in Detroit; a hole in a traveler's story.

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.

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.

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.

An American tourist is caught renting by the hour, but insists she needs to meet up with her boyfriend.

At O'Hare International, a returning American's bananas cause a slip-up in secondary; a mother covers for her kid at Detroit's Ambassador Bridge; a car search is brought to a head in Washington State.

Officers search for a fugitive in Washington State; a cook is questioned on his way to Las Vegas; a canine flags several packages in Chicago; x-rays discover anomalies in Port Huron cargo.

An officer's expertise in body language pays off; a German rock band in Detroit; a hole in a traveler's story.

Three stories of the untapped power of the human brain.

Cesar rehabs a boxer with an aggressive obsession with attacking handbags.

Cesar finds a match for a young couple and helps with separation anxiety.

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.

A pioneering gorilla treatment, rhino fitness tracker and tortoise party.

A collection of thrilling moments when wildlife gives safari visitors an unforgettable adventure, from a prowling lion breaking a tent to an angry elephant charging a truck.

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

A pioneering gorilla treatment, rhino fitness tracker and tortoise party.

A collection of thrilling moments when wildlife gives safari visitors an unforgettable adventure, from a prowling lion breaking a tent to an angry elephant charging a truck.

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

Cesar rehabs a boxer with an aggressive obsession with attacking handbags.

Cesar finds a match for a young couple and helps with separation anxiety.

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

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

A Chicago canine unit discovers smugglers; officers enter a high-speed chase in Port Huron; a traveler triggers radiation alarms; bullets in Blaine, Washington.

In the Detroit airport, a family traveling 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 traveler 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.

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

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.

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

A Chicago canine unit discovers smugglers; officers enter a high-speed chase in Port Huron; a traveler triggers radiation alarms; bullets in Blaine, Washington.

In the Detroit airport, a family traveling 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 traveler 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.

Ancient artifacts that could change history.

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.

Rob Kraft hunts for Musashi, the biggest battleship ever built and considered to be unsinkable by the Japanese.

Research vessel Petrel picks up what they believe to be the debris trail of the USS Johnston; a manned submersible is deployed to potentially put eyes on the deepest shipwreck in the world.

Finland's impressive defense 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.