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+.