Nat Geo HD

When a truck smashes into a barrier, Thord and Bjoern work into the small hours to save its cargo. Jo is called out of his bed to rescue a truck buried in snow. 7+.

Severe winter weather brings chaos to the mountains and Thord's running out of options. 7+.

Jo Roger and Ole Henrik struggle to rescue a trailer load of salt that threatens to pollute Norway's biggest salmon river. Any slip-up could cause an environmental disaster. 7+.

A unique documentary charts the extraordinary journey of the tornado that struck El Reno, Oklahoma, on 31 May 2013: one of the largest and fastest twisters ever recorded. 7+.

When a dam collapses, the resulting disaster can be as catastrophic as a tsunami, inundating communities and destroying everything in its path. (8 of 9) 7+.

A C-130 firebomber crashes while battling an epic Australian wildfire. And ATSB investigators must determine the cause within an active fire zone. (S24, 3 of 10) 7+.

With all the emergency agencies involved in a simulated plane crash exercise, real problems place airport operations in jeopardy. 7+.

A Labrador has his first day as a drug sniffer, the managers see if they can smuggle a fake bomb past their screening teams and Annie faces her moment of truth. (S1, ep 8) 7+.

Spring break puts new pressure on the airport infrastructure, its staff and the very planes themselves. (S1, ep 8) 7+.

Investigators come to a frightening realisation as they sort through the shattered wreckage of a commuter flight to Detroit. (S16, ep 2) 7+.

Authorities suspect a terror attack when a plane explodes after taking off from JFK. The FBI joins investigators in their search for answers. (S16, ep 4) 7+.

The Roman Empire dominated millions of miles of land and sea. What secrets powered its rule over the waves for four centuries? (S2, ep 4) 7+.

Rise of the Gladiator: A soldier enslaved by Rome and forced into gladiatorial combat leads fellow gladiators in a daring escape. (S1, ep 1) 7+.

Investigations across Italy explore the roots of this symbol of Roman power and the gladiator games that were held there. (S1, ep 1) 7+.

Experts find rare treasures and secret tunnels as they hunt for the ancient ruler's tomb in Egypt. But their biggest find is an extraordinary discovery nobody was expecting. 7+.

Experts learn secrets of the Roman Empire when they uncover one of the oldest shipwrecks in the world. A port lost for centuries is also discovered. 7+.

A suspicious passenger arriving from Nigeria tells a story that doesn't quite add up and agents have their hands full with a controlled delivery of MDMA. (S1, ep 7) 7+.

In New York, a joint operation led to the discovery of a white powdery substance in a bag inspected coming off an international flight. (S1, ep 8) 7+.

Investigation into the recently released Whitehall files on UFO and alien sightings in Britain, including 'The Welsh Roswell' and claims Winston Churchill ordered a UFO cover-up. 7+.

Mona Lisa Code & The Bone Chamber: Expeditions unlock time's biggest mysteries, starting with Malta's creepy 'Hypogeum' and an alleged code hidden in the Mona Lisa. 7+.

Incas Decoded & Viking Sun Stone: Experts try to break the baffling code of the Incas, and investigate the existence of a magical crystal allegedly owned by the Vikings. 7+.

Discover how savoury garlic naan, crunchy cheesy puffs, creamy maple cookies and sinfully sweet truffles get made. (S2, ep 5) 7+.

A look at how chewy chocolate treats, nutty health bars, creamy orange bonbons, and a popular zesty condiment are made. (S2, ep 6) 7+.

7+.

Chris looks back at 100 years of technology and inventions, beginning with the decade that produced the new weapons, trucks, planes and ships used in WWI. 7+.

A C-130 firebomber crashes while battling an epic Australian wildfire. And ATSB investigators must determine the cause within an active fire zone. (S24, 3 of 10) 7+.

An investigation into the decisions and failings that culminated in the world's biggest accidental marine oil spill in 2010, leaving 11 crewmen dead. 7+.

After a lacklustre wolf pack operation, an American submarine commander penetrates the defences of a Japanese convoy in the Luzon Strait. (S3, ep 4) 7+.

As Hitler sets his sights east, waves of German bombers obliterate the Soviet city of Stalingrad. (S3, 4 of.

The second fatal crash involving the Boeing 737 MAX 8 in five months occurs when Ethiopian Airlines Flight 302 nosedives, killing everyone on board. (1 of 10) 7+.

In 1982, a British Airways jet plunged toward the ocean after flying through volcanic ash from an eruption. Could the crew restart the engines? 7+.

An attempt on Hitler's life must now come from within. A small group risk their lives to plot the assassination. (S1, ep 3) 7+.

Rise of the Gladiator: A soldier enslaved by Rome and forced into gladiatorial combat leads fellow gladiators in a daring escape. (S1, ep 1) 7+.

Thord and Bjoern rescue a truck that threatens to tip, while Jo Roger looks to save a snow plough - before a second truck crashes in the same spot. (S9, ep 8) 7+.

A look at how Japanese forces constructed a devastating killing ground for American troops at the Battle of Okinawa. 7+.

Examine the startling events of Helios Flight 522, which crashed into the side of a mountain when all on board inexplicably slipped into unconsciousness. 7+.

In humanity's pursuit of space exploration, numerous tragic disasters have unfolded, from the Apollo 1 fire to the Challenger and Columbia tragedies. (4 of.

Documentary following the tragic story of NASA's Space Shuttle Challenger which exploded just moments after lift-off in 1986. Onboard, was the first civilian to be sent into space. 7+.

Maritime rescue operations are one of the mainstays for the Dutch Caribbean Coast Guards who protect the waters around Aruba, Curaçao and Sint Maarten. (S2, ep 1) 7+.

After taking off with a major storm on the horizon, Copa Airlines Flight 201 disappears from the radar over one of the most remote jungles on Earth. (S13, ep 4) 7+.