National Geographic Channel HD Friday

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Landing at LAX, US Air 1493 collided with another aircraft and burst into flames. Investigators need to figure out why 21 passengers were unable to escape

Adrenaline junkie Jin Xiao and fearless cave diver Han Ting explore one of China's biggest underwater cave systems in Du'an

A spike in the temperature threatens Rocky Mountain's shipments. The team struggles to shore up the track after mudslides and washouts devastate the railway line

Fuzz Townshend and Tim Shaw take on a rundown Renault Alpine GTA belonging to David, a former computer technician suffering with il-health

An emergency in air traffic control leads to a runway closure, which has major consequences all across the airport. Meanwhile, problems arise on the site of the new terminal

When basketball legend Kobe Bryant is killed in a helicopter crash in Los Angeles, investigators look for clues amid a global outpouring of grief

Part one of two. During the Second World War, Nazi U-boats strike terror off America's coast. Today, a dive team transforms a forgotten graveyard into a timeless memorial

Part two of two. Unlocking the secrets of a virtually unknown Second World War battleground, the team dives deep to uncover a Nazi U-boat that became a tomb for its crew

Experts head 100 metres under the sand as they investigate why the pharaohs swapped the Giza pyramids for a secret cemetery in the Valley of the Kings

The wrecks of planes and ships from the Battle of Britain, revealing new details on how British forces were able to repel the possibility of a Nazi invasion

Uniquely colourised footage and oral testimony reveal the cost of liberating Western Europe in the last year of the Second World War

Experts investigate why Alitalia Flight 404, which crashed into a hill on its way into Zurich in November 1990 - killing everyone on board - was flying so low

Tenerife airport is flooded with aircraft rerouted by a terrorist bombing, which leads to two planes attempting to leave the runway colliding at high speed

Investigating what caused John F Kennedy Jr's light aircraft to crash into the Atlantic Ocean in 1999, killing him, his wife Carolyn and his sister-in-law Lauren

A crew sails a Viking ship across the North Atlantic using ancient methods alone, facing storms, exhaustion and the open sea

An out-of-control turboprop breaks apart while trying to land at Düsseldorf airport, instantly killing everyone on board

Maritime patrols chase tobacco smugglers in the South, while in the North-East, multiple lives are in jeopardy

Rookie CBP officers find multiple drugs, HSI runs an undercover buy-bust operation, and agriculture specialists stop pests and prohibited items

Rich makes a shock discovery in a science lab, while Diego looks to make a mint from old spark plugs and Dave gains access to a huge metal factory

How Gibson Guitars in Nashville, Tennessee, make their iconic instruments, a process that combines advanced machinery, hand crafting skills, and global logistics

How Airbus constructs the H-125, the world's most popular single engine helicopter

Examining how zesty peppermint-puff hard candies, flaky cheese straws, mango chutney and sugary love hearts are made

An insight into how sugary, shiny Mike and Ikes, Turkish Taffy, cool and refreshing Arizona iced green tea, and rich and luscious shredded cheese are made for the masses

As mating season comes to an end, one male moves quickly to protect a pregnant female from predators, while another gets carried away defending its territory

Two pregnant females struggle to survive when their mates are killed. One is taken in by the male that killed the father of its offspring - whose own mate is less than pleased

Teleshopping.

Teleshopping.