National Geographic (Canada)

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.

Archaeologists excavate a buried city in Jordan, dive a sunken temple in Italy and explore Petra to shed new light on how Rome conquered the east.

Archaeologists excavate the vast frontier of the Roman Empire, investigating the battle to keep it safe.

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.

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.

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

Officers question a man from Texas who arrives with his hunting equipment.

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

Cesar rehabs an overprotective Great Dane mix.

A Chihuahua poses a threat to a pet mom's romantic life.

Cesar finds a dog to help a woman heal; he helps a territorial Maltipom.

Cesar rehabs two aggressive German Shepherds, and one very loud Min Pin Mix.

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

A cattle dog protects her fearful owner, and a family finds a perfect pal.

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.

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

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

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

Cesar rehabs an overexcited labrador and a pushy adolescent doberman.

Cesar rehabs two aggressive German Shepherds, and one very loud Min Pin Mix.

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

A cattle dog protects her fearful owner, and a family finds a perfect pal.

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

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.

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

A Dutch woman with a lot of luggage claims she's on a four-day holiday; a Chinese parcel contains a shocking surprise; actor Corey Feldman shows up.

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

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

The crew of a Metal Shark investigates a tip about the possible dealing of laughing gas on a party boat; an abandoned dinghy with possible human remains is located.

The crew of the DASH-8 aircraft face a challenging rescue operation of 14 drowning people from a sunken oil tanker; in Aruba, the Coast Guard searches for drugs on a local fisherman's boat.

A Coastguard naval vessel is involved in the interception of a drug boat; the crew of the helicopter is called out to perform a dangerous rescue.

A naval vessel is involved in two thrilling interceptions of drug boats; the helicopter crew attempts a rescue of a mysterious man at sea.

The interception of a drug boat by a Navy helicopter leads to a dangerous situation; the DASH-8 attempts to rescue two fishermen.

An NH-90 naval helicopter intercepts a fleeing drug boat; the Metal Shark crew attempts to save undocumented migrants from a sinking boat.

The Coastguard inspects a suspicious Colombian ship with a concealed hatch; the Metal Shark team rescues a Swedish sailboat that went missing.

A navy vessel opens fire on a drug boat that won't stop; a Metal Shark crew in Aruba tries to calm down a captain's temper.

Looking into the journey and the story behind the notorious Stanford Prison Experiment, as told by its prisoners and guards.

Secrets that unravel Dr. Zimbardo's official story come to light.

As rescuers race to save 33 trapped miners in northern Chile, a discovery transforms a desperate search into a hopeful mission.

Dr. Zimbardo defends his claim to fame; an unexpected reunion takes place.

Secrets that unravel Dr. Zimbardo's official story come to light.

As rescuers race to save 33 trapped miners in northern Chile, a discovery transforms a desperate search into a hopeful mission.

Dr. Zimbardo defends his claim to fame; an unexpected reunion takes place.

A Coastguard naval vessel is involved in the interception of a drug boat; the crew of the helicopter is called out to perform a dangerous rescue.

A naval vessel is involved in two thrilling interceptions of drug boats; the helicopter crew attempts a rescue of a mysterious man at sea.

The interception of a drug boat by a Navy helicopter leads to a dangerous situation; the DASH-8 attempts to rescue two fishermen.

Officers question a man from Texas who arrives with his hunting equipment.

A Dutch woman with a lot of luggage claims she's on a four-day holiday; a Chinese parcel contains a shocking surprise; actor Corey Feldman shows up.

An angry businessman hides the real reason for his hostility; officers try to process some unusual Mexican migrants.

Officers drill an American oil worker with a shady past; a British traveler's proposed reunion with a girlfriend could be cut short.

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

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

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

Officers question a man from Texas who arrives with his hunting equipment.

A Dutch woman with a lot of luggage claims she's on a four-day holiday; a Chinese parcel contains a shocking surprise; actor Corey Feldman shows up.

An angry businessman hides the real reason for his hostility; officers try to process some unusual Mexican migrants.

Officers drill an American oil worker with a shady past; a British traveler's proposed reunion with a girlfriend could be cut short.

A long winter forever changes the paths of Port Protection's residents.

Carl hunts a deer; Troy dives and Curly and Veronica embrace danger.

In Port Protection, tools aren't always used for what they're intended.

Curly helps battle a group of deadly trees on his neighbor's property.

In Port Protection, good friends equal survival, as one hand helps another.

Sam and Squibb attempt to salvage an unwieldy boat mast.

Hoping to add a new weapon to his fishing arsenal, Oliver hits the water with Carl, Matt and a new set of slinky pots, and they're in for a shock.

Milestone achievements are only possible with steep challenges in Port Protection; Carl and Matt pull a 3,000-gallon barrel up a cliff.

CBP officers in Newark search for a stolen luxury vehicle.

With the help of Troy and Sarah, Squibb tackles a ticking time bomb that threatens to kill all life in the Bay.

Milestone achievements are only possible with steep challenges in Port Protection; Carl and Matt pull a 3,000-gallon barrel up a cliff.

CBP officers in Newark search for a stolen luxury vehicle.