National Geographic (Canada)

Border Patrol finds a smuggling tunnel; CBP seizes silver bars and coke.

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

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

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

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

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

A 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.

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

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

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.

The source of Slumach's lost gold.

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.

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

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

Mariana goes inside the world of contract killers.

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

Mariana launches an investigation into a complex scam that targets seniors, tricking them into becoming drug mules.

Mariana's investigation into how gold mining is funding terrorism gets interrupted by a military coup that strands the team in Niger.

Mariana explores the growing influence of Mexican cartels in the U.S.

Mariana heads to a Southeast Asian hotbed of scamming, where criminal organizations are holding thousands of hostages and forcing them to scam.

Mariana investigates the mysterious next wave of America's opioid crisis.

A young CIA officer is kidnapped abroad, triggering a tense 24-hour standoff.

Mariana travels to Vietnam to investigate reports that young women are being trafficked into China to be sold as unwilling brides.

Mariana investigates the mysterious next wave of America's opioid crisis.

A young CIA officer is kidnapped abroad, triggering a tense 24-hour standoff.