Nat Geo HD

Chad joins the team charged with stripping down and rebuilding the biggest cargo plane ever. (S1, ep 5) 7+.

After an extensive retrofit, three Airborne Express pilots board a modified DC-8 cargo plane for a routine test flight that ends in disaster. (S24, ep 9 of 10) 7+.

The Roman Empire once controlled 25% of the world's population. Now, archaeologists are excavating this vast frontier. (S2, ep 5) 7+.

When Hitler sends U-Boats to protect his troops, a German sub rushes towards the fjords leading to Narvik - the scene of two major naval battles. (4 of 6) 7+.

A look at how Hitler's vast network of railways became the lifeblood of the Nazi empire, spreading Hitler's ambition and control across Europe. (S4, ep 1) 7+.

Documentary looking at the tragic circumstances of the bombing of Pan Am Flight 103, which was the largest terrorist attack on Americans before the events of 9/11. 7+.

In September 1989, Partnair Flight 394 crashed into the sea killing all 55 people on board. Follow the review of the biggest air disaster in Norwegian history. 7+.

Hitler was famously against using chemical and biological weapons but chemistry and biological science still played a role in the Nazi's quest for power.

The Battle for the Black Swan: Archaeologists and treasure hunters battle over half a billion dollars worth of gold. Who will win the fight for the Black Swan? (S4, ep 7) 7+.

Jo Roger's rookies are put to the test with a triple rescue, but the mission gets off to a rocky start when their most powerful truck gets stuck. (S7, ep 6) 7+.

From bridges to highways, skyscrapers to supermarkets, these are just some of the structures showcased in Construction Fails. (S2, ep 2) 7+.

A DC-9 is caught in a storm so severe that hailstones crack the cockpit windshield, causing the plane to plummet to the ground. Miraculously 20 people survive. 7+.

Rare colour footage shows how Hitler revealed his haunting mission to save Germany. But few would listen to the mediocre artist... until the 1929 economic crisis. (1 of 2) 7+.

Colour footage reveals how Germany sank into despair. With no-one to defend democracy, Hitler becomes chancellor. He advocates peace but the Nazis prepare for war. (2 of 2) 7+.

After being invaded by the Germans in the west and the Soviets in the east in 1939, the Poles were liberated during the Battle of Barbarossa.

Flying from the Kathmandu to Pokhara, Yeti Airlines Flight 691 stalls and crashes into a gorge where investigators find a scene of annihilation. (S25, ep 8) 7+.

Tim and Fuzz head to Huddersfield to rescue a 1992 VW Corrado, a German coupe that was once one of the fastest small family cars on the road. (S10, ep 2) 7+.

HSI and CBP uncover nearly $500K in meth and fentanyl, bundles of cash, bricks of cocaine and thousands of dollars worth of counterfeit goods. (S6, ep 1) 7+.

The team hit the jackpot in an abandoned church, finding a Tiffany-style stained glass window and the remains of a basement bowling alley. (S1, ep 12) 7+.

John Deere opens the doors to their Iowa mega-factory to reveal how they make the world's most powerful tractors, big machines designed to feed the world. (S1, ep 9) 7+.

New Balance reveal how high-tech machinery, hand-crafting skills and global logistics combine to make their best-selling sneaker across the world. (S1, ep 3) 7+.

A look at how millions of cherry chews are made, with macaroni, cranberry cheesecake and more. (S5, ep 2) 7+.

Get the inside scoop on honey, sprouted wheat bread, a checkerboard cookie, and irresistible chocolate-covered cherries. (S5, ep 3) 7+.

The Columbus Zoo's new resident, a polar bear named Lee, arrives in Ohio and must get through quarantine. (S1, ep 12) 7+.

Keepers help Katie the koala get better by ingesting her partner's feces. Over at The Wilds, the team welcome several newborn baby takins. (S2, ep 1) 7+.

7+.

Chad joins a critical mission for the USS Carl Vinson as he explores the inner workings of this incredible floating city. (S1, ep 6) 7+.

Air Tahoma Flight 185, a late-night cargo flight from Memphis, is on final approach to Cincinnati. (S24, ep 10 of 10) 7+.

Count down the moments leading up to the 'unsinkable' ship's demise on 14 April 1912. An iceberg, too few lifeboats and freezing waters combined in an oceanic tragedy. 7+.

After their first war patrol ends in conflict, a new submarine Commander must build trust as they travel to target enemies in dangerous Japanese waters. (5 of 6) 7+.

A look at how Hitler and Holocaust mastermind Heinrich Himmler used a vast rail network to transport Jews to their death. (S4, ep 2) 7+.

When Saudi Airways and Kazakhstan Airlines jets hit each other at 14,000 feet, both planes were sent spiralling to the ground. But what caused their impact? 7+.

A tragedy from the Vietnam War, when more than 250 children, who were being airlifted to safety on a US Air Force C5A Galaxy, died in a mysterious explosion. 7+.

Exploring a history of firsts, from the Fritz X to the world's first precision-guided weapon deployed during combat.

Draining Lake Michigan uncovers Chicago's secret history and exposes a catastrophe that killed 300 people and reveals an engineering marvel. 7+.

Thord and Andrzej fall prey to the Norwegian winter and, in a shocking twist of events, they end up in need of rescue! (S7, ep 7) 7+.

An overpass on Philadelphia's busy Interstate- 95 highway sets ablaze after a tanker truck rollover. (S2, ep 3) 7+.

Flying from the Kathmandu to Pokhara, Yeti Airlines Flight 691 stalls and crashes into a gorge where investigators find a scene of annihilation. (S25, ep 8) 7+.

Linguist Dr Mary Walworth and local marine ecologist John Aini join Will as he travels to the South Pacific to an island threatened by rising seas. (S1, ep 4) 7+.

Hear from insiders who secretly worked on jaw-dropping aircraft and weapons systems at the highly classified military base. 7+.

Spiculus becomes a superstar in Rome's brutal arenas. Rewarded with wealth and privilege, he fights for glory.

Mid-air hijack? Mechanical breakdown? Pilot error? Follow aviation experts as they dissect this mysterious case. (S13, ep 10) 7+.