TV Guide National Geographic Channel

A new 3D survey of the Tham Luang cave system in Thailand offers details about how the 12 boys were rescued from the cave after being trapped there in 2018.

The oceans are drained in order to reveal the lost wrecks of the American Civil War.

Experts use new technology to explore the Pacific Ocean so that they can learn detailed information about Japan's involvement in World War II.

German U-boats are closely examined with the help of new technology to show how the vessels operated as the world's first stealth weapons.

A survey of the World War II D-Day shipwrecks sheds light on the biggest amphibious invasion in history.

Details are shared about how the United States has invested a great amount of time and money into military black sites and secret operations.

Details are shared about North Korea's ruling family to reveal how the country believes the Kim family is saving them from total destruction.

Journalist Lisa Ling goes on an undercover assignment in North Korea to learn more about the highly secretive nation and its citizens.

A detailed look is taken at how North Korea can be viewed as a brutal dictatorship that has opted to isolate itself from the rest of the world.

Details are shared about the power structures at play in North Korea to reveal who might take command if the current leader is unable to rule.

Details are shared about cybercrimes in North Korea, including how the nation has a force of cybercriminals consisting of 6,000 individuals.

An ongoing search for a peaceful end to the Korean Peninsula conflict is shown, and the individuals most directly involved have a talk about their struggle.

HSI runs a human trafficking sting at a Kansas City hotel; CBP in Philadelphia hunts for a passenger suspected of making terroristic threats in the U.S.

Homeland Security Investigations organize money laundering stings; Customs and Border Protection has its largest drug seizure in Los Angeles Airport's history.

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

Customs & Border Protection in JFK International Airport and San Diego Homeland Security Investigations tackle fentanyl crisis on opposite coasts.

Air and Marine Operations hunts for a boatload of cocaine; U.S. Customs and Border Protection

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

Homeland Security Investigations performs an undercover drug sting; the U.S. Customs and Border Protection finds cocaine in the Rio Grande Valley.

U.S. Customs and Border Protection's K9s sniffs out hidden cash; U.S. Department of Homeland Security Investigations intercepts a $2 million drug deal.

An elderly woman attempts to smuggle illegal substances in her hand bag; a suspected accomplice to a smuggling group is tracked by investigative authorities.

Law enforcement officials confront a smuggler who is traveling with her young daughter; police teams discover smuggled cocaine in packages of food.

Specially made drinks infused with cocaine are uncovered by careful investigators; a person travelling with specially made suitcase is caught hiding cocaine.

A desperate woman uses her own child as a decoy while she smuggles cocaine, but authorities are able to determine her deception and detain her.

Anti-drug agents and law enforcement officers in a Peruvian airport encounter several suspects and accomplices who are accused of smuggling crimes.

A woman is arrested while trying to smuggle cocaine while traveling with her 2 young children; drug cartels are looking for new carrier profiles in the elderly.