Clueless carriers, and people betrayed. Officials from Airport Security Colombia and Peru must remain vigilant. A woman's boyfriend asks her to carry bottles. She has no idea they contain liquid cocaine. A man with cocaine in his suitcase claims his son-in-law is responsible. A US woman may have been tricked into drug-trafficking. A construction worker is given a bag with cocaine. Of two Ukrainian friends, one claims to have tricked the other.

Parents with kids are arrested for drug-trafficking. From Airport Security Colombia and Peru, cocaine busts that include families. A mother with kids going to Barcelona carries cocaine in food packages. A man with kids at home confesses. A mother leaving the country with kids uses fake documents. A woman with her infant son enters the country with help from officials. A couple are not what they seem. The woman did it to help her daughter.

Stories of suspects who almost got away from Airport Security Colombia and Peru. A farmer swaps his suitcase with an accomplice in the terminal. A man who ingested cocaine is able to board a plane, but through international police coordination, is apprehended at his destination. A man with capsules in his stomach holds out for 36 hours and must be released. His sister is arrested. Cocaine cargo has been chemically disguised to fool officials.

Hippos are invading Colombia, thanks to Pablo Escobar. The government must act, but it's complicated. What will be the fate of these giant invaders?

For years psychedelics were forced into the shadows in a de facto prohibition. But today we're learning just how much they can help heal modern ills.

The war on pot is not over. Penalties and jailtime are still a threat, and cannabis entrepreneurs struggle to adapt.

In this episode, we learn the science behind the fails when 'tractor pulling', motorbiking through snow or riding a monowheel.

Through funny user-generated clips, and with the help of bespoke animations and super slo-mo cinematography, Dallas Campbell explains 'Science of Stupid'.

Fire trucks carry firefighters into battle every day. Pierce fire trucks build 18,000 of them from the ground up, every year. This is the story of how they are made.

America's best-known liquor started 150 years ago, in Lynchburg, Tennessee. This same distillery now makes over 120 million bottles a year.

Why aren't we prepared for disasters in a way that would save countless human lives?

Our quest to conquer the skies has led to some of our greatest achievements. But engineering errors and human mistakes have caused tragic disasters along the way.

An incoming plane has been struck by lightning several times. Engineers check for damage as passengers become more aggressive with the growing delays.

Torrential rain closes two runways as an incoming flight deals with a life or death situation. A fire training exercise turns into the real thing.

Survivors' stories and world-leading shipwreck investigators uncover how the most powerful warships in history had their weaknesses and paid a fatal price.

The stories of two of the greatest failed invasions in the history of naval warfare. In 1588 King Philip II of Spain assembled his Armada to sail to England and overthrow Queen Elizabeth I.

Sir Francis Drake, a hero to the English, known as The Dragon to the Spanish. One of the world's most controversial pirates.

Born into a seafaring family, O'Malley defied gender conventions to become the most feared and respected leader of both the land and the sea.

Homeland Security Investigations, Orange County performs 3 undercover drug stings with multiple arrests. Customs and Border Protection finds cocaine hidden under a vehicles backseat in Rio Grande Valley.

CBPs K9 sniffs out stacks of hidden cash in Atlanta. HSI air surveillance tracks a multi-level drug deal in San Diego, seizing $2 million of dope.

A helicopter carrying offshore oil workers crashes into the ocean off the coast of Newfoundland and a far-reaching investigation reveals a fatal flaw.

Air Crash Investigation 4 investigates legendary aviation disasters to find out what went wrong and why.

Air Crash Investigation 4 investigates legendary aviation disasters to find out what went wrong and why.

Host Diego Buñuel ventures deep underwater to vast graveyards of Maya human sacrifices and through dangerous underground tunnels to new revelations about the Maya calendar. Ground breaking National Geographic technology, a brilliant SUNSPHERE that turns darkness into day, makes his quest unique. The search leads him to understand more about the mysterious collapse of Maya civilization over 1000 years ago. And how the Maya may have forecast the same fate for us. Is the Maya Doomsday prediction scheduled to happen on December 21, 2012? Should we bother buying Christmas presents? Buñuel has the answers.

Albert follows the treasure map to a new pyramid that no one knew, hidden in the dense jungle at the heart of the ancient Mayan city El Palmar.

Newly discovered cave systems deep in the jungle are explored for the first time in a millennium, unearthing evidence of ancient Mayan ritual.

The new treasure map leads to discovery of a lost fortress - a sacred altar is unearthed after 1500 years buried in a ruined temple, revealing secrets of the legendary Maya Snake King uprising.

Archaeologists uncover treasures that reveal a civilisation of epic scale and sophistication, from a private palace to an obsidian knife blade.

This film follows Sowell's journey of discovery, loss and adventure as he seeks the truth about this sacred place.

A brilliant strategist, Morgan takes humans, treasure, and Spanish colonial towns with no mercy.

Sir Francis Drake, a hero to the English, known as The Dragon to the Spanish. One of the world's most controversial pirates.

Clueless carriers, and people betrayed. Officials from Airport Security Colombia and Peru must remain vigilant. A woman's boyfriend asks her to carry bottles. She has no idea they contain liquid cocaine. A man with cocaine in his suitcase claims his son-in-law is responsible. A US woman may have been tricked into drug-trafficking. A construction worker is given a bag with cocaine. Of two Ukrainian friends, one claims to have tricked the other.

Carriers are often defiant towards officials, but crumble in the end. Cases of protest and denial from Airport Security Colombia and Peru. Sisters deny ingesting drugs but break down when one reveals she is pregnant. A drunk man denies the checked bag is his but is arrested and confesses. A young woman claims she is innocent but may have a mental illness. A young man with liquid cocaine in beer lies at first, but then breaks down.

These carriers are frequent flyers. From Airport Security Colombia and Peru, a Spaniard with cocaine pretends to be shocked. A man going to the DR with cocaine tells officers he has been there before. A man on his second trip claims he was forced. A woman uses someone else's authentic passport to travel. An Indonesian woman carries cocaine and multiple types of currency. A freelance trafficker boasts he has information on a 1000 kilo load.

In Airport Security Colombia and Peru, suspects try to evade detection. A couple traveling to Punta Cana are not what they seem.