HSI takes down a suspected weapons trafficker with ties to organized crime. Meanwhile, CBP agents are on high alert for popular club drugs being concealed in liquid form.

Traced to a breakdown of vital safety measures, three horrific disasters provoke fundamental changes to airport security procedures around the world.

Three disasters reveal the threat of poor weather to a safe landing. Heavy rains aren't the only obstacle Flight 495 has as it crashes.

Evidence from the disappearance of EgyptAir Flight 804 leads investigators to theorize different causes for the plane's spiral into the Mediterranean.

En route from Washington, D.C. to Columbus, Ohio, United Express Flight 6291 is on its final approach when the high-performance twin turboprop crashes just a mile from the runway.

After Colgan Air 9446 crashes off Cape Cod, investigators must determine what brought down a widely-used commuter aircraft in under three minutes.

Find out what it takes to make a 5,000-pound cheese wheel, and these irresistible blondies are shipped to snack-lovers across the country.

Three million deep-fried cheese curds are produced here daily, and it takes a mountain of pecans to keep up with demand for these cow patties.

Satisfy your sweet tooth with these handcrafted pecan pralines, and find out how a tangy sauce helped put this major league snack on the map.

Witness a fig Newton that's literally 80-feet long, and find out what makes this seasonal Wisconsin butter so special.

In this episode we learn about motorcycle flips, how to avoid hurt when attempting to parkour lache, and how to avoid humiliation when walking up stairs.

In this episode we take a deep dive into entropy, learn the secrets of bowling lane etiquette, and discover the best way to carve on a snowboard.

In this episode we learn the science behind driving on black ice, using food blenders, and attempting to bounce off giant inflatables.

In this episode we learn the science behind the fails when driving tracked vehicles, jumping down stairs on unicycles, and getting into kayaks.

Witness a fig Newton that's literally 80-feet long, and find out what makes this seasonal Wisconsin butter so special.

Find out why these tealeaves get to lie down on the job, and these ice cream sandwiches have been a San Francisco tradition since 1928.

Discover the humble black olive's story, enjoy guilt-free fruit and veggie pops, and learn about the production of millions of cookie chips.

Discover how potatoes become Mexi-Fries, Hollywood's connection to chocolate toffees, and California's perfected absinthe distillery.

Emirates Airlines bring in an Airbus A380 for a thorough maintenance check. Mel encounters a passenger travelling with a fake passport.

A passenger jet comes into the Aircraft Appearance Centre to get a makeover. The airportÕs double runway overhaul is unveiled.

From a buried film set to a WW1 Navy ship and old fishing barge, we discover the role these ruins played in Hollywood movie-making history.

Examining hidden giants can explain New York City's meteoric rise to bustling world metropolis. A city that can't be kept down, forever pushing forward, with true grit and determination.

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.

The biggest cocaine busts from Airport Security Colombia and Peru. A man traveling to the DR, hides cocaine in children's organizers. A stepmom and daughter conceal bricks of cocaine inside jackets. A mother with a child carries cocaine in food packages and kid's clothes. The Anti-narcotics police find cocaine in a shipment of fresh herbs. A man going to Mexico with cocaine bricks in his carry-on. A man with liquid cocaine in beverage bottles.

A Homeland Security Investigations stakeout leads to nearly $500K of meth and fentanyl in San Diego. Customs and Border Protection finds concealed cash and a carload of cocaine at the El Paso border.

In the heat of El Paso, CBP stops 30 kilos of cocaine from crossing the border. Officers intercept 150K-dollar worth of illegal pills in Philadelphia.

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

A massive explosion tears a hole in a 747 over Hawaii, and the trail of clues ultimately leads investigators to a catastrophic short circuit.

Dangerous situations turn deadly when pilots ignore their training. Basketball legend Kobe Bryant is among the casualties in this crash.

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.

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.

After finding fentanyl in passenger area, Customs and Border Patrol agents in JFK conduct operation blitz on all food courier bags from Mexico.

HSI helps Colombian National Police take down illegal gold mining ring. CBP finds almost $1.5 million cartel drug haul at RGV port in Texas.

In the extreme north, the hunt for a legendary ghost ship in Alaska reveals a corner of the United States once known as 'Russian America'.

Examining hidden giants can explain New York City's meteoric rise to bustling world metropolis. A city that can't be kept down, forever pushing forward, with true grit and determination.

HSI Miami investigates two separate maritime smuggling cases and seizes more than 450 kilograms of cocaine off a yacht coming from the Caribbean.