Nat Geo+1

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.