National Geographic Channel HDTV (NGCHD)

Mariana exposes the dangers of the growing and deadly ghost guns industry. (Repeat).

Mariana explores surrogacy's dark side; a babies-for-cash black market. (Repeat).

Mariana investigates how illicit oil is fueling terrorist groups worldwide. (Repeat).

Mariana investigates the growing popularity of bare-knuckle fighting. (Repeat).

Mariana embeds with crypto scammers who show her how they make millions. (Repeat).

Mariana investigates the lucrative black market for private data. (Repeat).

Paid Programming. (Repeat).

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A quest to uncover the dreadful truth behind Hitler's deadly Vengeance rockets. (Repeat).

Looking into the U.S. Army's longest battle. (Repeat).

The team investigates how the Allies halted the Japanese in the jungles of Papua New Guinea. (Repeat).

The Japanese attack on Pearl Harbor changes the world. New technology reveals hidden traces of that attack, on the land and in the sea. (Repeat).

Looking into how the Allies end up in a deadly block on the road leading to Rome. (Repeat).

Looking into how the island of Malta withstood Hitler's bombing. (Repeat).

Archaeologists hunt for keys to the afterlife and find evidence of grave robbing. (Repeat).

A hunt for Cleopatra's lost tomb reveals a secret underground tunnel network. (Repeat).

A find inside an ancient quarry reveals clues about the great female pharaoh Hatshepsut. (Repeat).

A dramatic find reveals ancient, state-sanctioned tomb robbery on an industrial scale. (Repeat).

Revealing lost tombs of the pyramids. (Repeat).

The mysteries of Tutankhamun are unlocked, and archaeologists open a 4,000-year-old tomb. (Repeat).

Stone artifacts, burial grounds and temple ruins excavated on Pitcairn Island shed light on a previously unknown civilization. Deep in the jungle of Borneo, researchers discover a strange, glowing green light emitting in the pitch dark forest. The remains of a long lost temple are found decaying on the Greek island of Euboea. Coral rubble unearthed on Sudan's Suakin Island unveils the vibrant past

Uncover ancient mysteries as archaeologists explore human remains from thousands of years ago, revealing clues about their lives and deaths. (New).

Revealing lost tombs of the pyramids. (Repeat).

Stone artifacts, burial grounds and temple ruins excavated on Pitcairn Island shed light on a previously unknown civilization. Deep in the jungle of Borneo, researchers discover a strange, glowing green light emitting in the pitch dark forest. The remains of a long lost temple are found decaying on the Greek island of Euboea. Coral rubble unearthed on Sudan's Suakin Island unveils the vibrant past

Uncover ancient mysteries as archaeologists explore human remains from thousands of years ago, revealing clues about their lives and deaths. (Repeat).

New insights from the seabed reveal how the Allies won World War II. (Repeat).

Chicago's extraordinary past emerges from the waters of Lake Michigan. (Repeat).

The oceans are drained to reveal the lost wrecks of the American Civil War. (Repeat).

Maritime archaeologists and historians go in search of the crucial component in the Atlantic Slave Trade: the slave ship. An armoured, floating fortress operating for over four centuries, capturing and transporting over 12 million Africans, who were sold and forced to work in brutal conditions in the New World. By draining we reveal the cruel technology on-board. (Repeat).

Paid Programming. (Repeat).

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Paid Programming. (Repeat).

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Paid Programming. (Repeat).

Newly discovered wrecks and graphics reveal forgotten stories from the American Revolution. (Repeat).

A legendary ancient Egyptian city gives up its secrets after being lost beneath the waves for 2,000 years. (Repeat).

Maritime archaeologists and historians go in search of the crucial component in the Atlantic Slave Trade: the slave ship. An armoured, floating fortress operating for over four centuries, capturing and transporting over 12 million Africans, who were sold and forced to work in brutal conditions in the New World. By draining we reveal the cruel technology on-board. (Repeat).

The oceans are drained to reveal the lost wrecks of the American Civil War. (Repeat).

Chicago's extraordinary past emerges from the waters of Lake Michigan. (Repeat).

New insights from the seabed reveal how the Allies won World War II. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

In space, tiny miscalculations can cause tragic disasters. (New).

In motorsports, tiny mistakes cause disaster. Explore the 10 worst crashes. (New).

Pirates, traders, and raiders. The Vikings were an unstoppable force no one saw coming. (Repeat).

In space, tiny miscalculations can cause tragic disasters. (Repeat).

In motorsports, tiny mistakes cause disaster. Explore the 10 worst crashes. (Repeat).

Margot, Matty, Billy and Emile & Gilbert begin work on their new northern homesteads. (Repeat).

The NWS homesteaders race to finish their projects before winter fully sets in. (Repeat).

The oceans are drained to reveal the lost wrecks of the American Civil War. (Repeat).

Maritime archaeologists and historians go in search of the crucial component in the Atlantic Slave Trade: the slave ship. An armoured, floating fortress operating for over four centuries, capturing and transporting over 12 million Africans, who were sold and forced to work in brutal conditions in the New World. By draining we reveal the cruel technology on-board. (Repeat).

Paid Programming. (Repeat).

Even if YOU do everything right to protect yourself, company and institutional data breaches are out of your control. Nearly 1 out of 4 US consumers have been a victim of identity theft. Find out how LifeLock can help protect your identity.

Paid Programming. (Repeat).

Paid Programming. (Repeat).

Paid Programming. (Repeat).

Paid Programming. (Repeat).

Gordon Ramsay travels to Alaska to learn about survival and Alaskan cuisine. (Repeat).

Gordon Ramsay travels to the Island of Maui to discover the secrets of Hawaiian cuisine. (Repeat).

Gordon Ramsay travels through Laos on a mission to unlock the secrets of its cuisine. (Repeat).

Gordon Ramsay ventures to Morocco to unlock the secrets of Berber cuisine. (Repeat).

Gordon Ramsay heads to New Zealand on a mission to discover the secrets of Maori cuisine. (Repeat).

In Peru's Sacred Valley, Gordon Ramsay uncovers the secrets of high-altitude Andean cuisine. (Repeat).

HSI snags a truck loaded with meth, while CBP's beagles sniff out contraband. (Repeat).

CBP intercepts 36 kilos of cocaine concealed in a car's floor, and stops a puppy smuggler. (Repeat).

HSI nabs car loaded with a medley of narcotics, while CBP seizes looted ancient artifacts. (Repeat).

CBP screens for club drugs hidden in toiletries, while HSI uncovers meth buried in garlic. (Repeat).

AMO agents in Puerto Rico chase a fleeing boat carrying $2.5 million worth of cocaine. (Repeat).

AMO Puerto Rico sinks a marine smuggling op; HSI San Diego seals up a drug tunnel. (Repeat).

In this enhanced episode, rookie CBP officers find multiple drugs. (New).

A high speed chase ending in the BVI lands AMO 1,800 kilos of coke. (New).

AMO agents in Puerto Rico chase a fleeing boat carrying $2.5 million worth of cocaine. (Repeat).

In this enhanced episode, rookie CBP officers find multiple drugs. (Repeat).

A high speed chase ending in the BVI lands AMO 1,800 kilos of coke. (Repeat).

HSI investigates cocaine concealed in cakes, and CBP cracks down on contraband cash. (Repeat).

HSI conducts a controlled delivery of meth, while CBP deals with an unruly passenger. (Repeat).

Hidden among the millions who enter the U.S. through JFK, MIA, and ATL is dangerous contraband. The Department of Homeland Security will stop at nothing to catch these smugglers. (Repeat).

CBP cracks down on party drugs, prostitution, and counterfeit goods during the Super Bowl. (Repeat).

Paid Programming. (Repeat).

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Paid Programming. (Repeat).

The harrowing story of how a crew of oil rig workers escaped a massive oil rig fire in the Gulf of Mexico, told through never-before-broadcast recordings and rare archival footage, photos and interpretive reenactments. (Repeat).

The story of the largest financial fraud in history, told 10 years after Madoff's arrest. (Repeat).

The inside story of how the most vicious drug cartel in the world was brought down. (Repeat).

Examining the history of Colombian drug lord Pablo Escobar including his rise to power and the cocaine empire he established. (Repeat).

Following the story of Arnold Schwarzenegger from body builder to action movie hero and later on to politician and governor of California. (Repeat).

A look at the life of rap producer Suge Knight including his rise to fame and later his arrest and accusations of attempted murder. (Repeat).

Saddam Hussein's rule over Iraq is examined. (Repeat).

In space, tiny miscalculations can cause tragic disasters. (Repeat).

Towers, bridges, cranes.: Ranking historys 10 most dramatic collapses. (Repeat).

From planes to trains: Ranking historys 10 most dramatic global disasters. (Repeat).