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After a huge blizzard, conductor Jim and engineer Jordy are hauling $50 million worth of freight. Plus, technician Derek makes a startling discovery. (S1, ep 1) 7+.

Conductor Grant and engineer Jeff race to collect a $3 million shipment of coal, while railroad engineer Kent prepares for a bridge inspection.

Follow a century-old steam loco on its mesmerising route from the plains of New Jalpaiguri to the foothills of the Himalayas. 7+.

A crew sails a Viking ship across the North Atlantic using ancient methods alone, facing storms, exhaustion and the open sea. (S1, ep 7) 7+.

Experts fail to find a bomb when a Taiwanese plane explodes, but they uncover something shocking in the overhead lockers. (S19, ep 3) 7+.

The pilots' personal lives come under scrutiny after eight people are killed in a two-plane collision on a foggy Detroit runway. (S19, ep 4) 7+.

Experts examine why Garuda Indonesia Flight 152 crashed into the jungle, killing 234 people, when it was minutes away from the Medan airport runway. (S16, ep 10) 7+.

Experts investigate the fatal crash of Crossair Flight 498. First they suspected phone interference, then they found drugs in the captain's flight bag. 7+.

A look into US Airways Flight #1549's ditch in the Hudson river. Just after take-off, its engines were crippled when it flew into a flock of birds. (S9, ep 5) 7+.

Relive the tragedy of an unresponsive Boeing 737 that was brought crashing into the ocean off Santo Domingo by a rogue insect nest. 7+.

Experts are baffled when the wreck of Thai Airways Flight 311 is found amid mountain peaks, miles away from its flight path. How did it end up there? (S16, ep 7) 7+.

Hidden chambers, medieval tombs, Roman relics and an ancient whale fossil reveal extraordinary secrets buried beneath our feet. (S1, ep 9) 7+.

As experts restore the Parthenon, archaeologists uncover the story of the ancient civilisation that built Greece's greatest monument. (S1, ep 2) 7+.

Experts face a real puzzle after archaeologists discover a tomb containing a princess, a noblewoman and 30 mysterious mummies. 7+.

As the final surge hits, Tom Hiddleston asks: Who survives and at what cost? New evidence reveals the fate of three real Romans. (3 of 3) 12+.

Etruscan Gold Teeth, Soutra Aisle, The Two Toes: Archaeologists uncover ancient medical secrets, from Etruscan dentistry to medieval surgery and an Egyptian prosthetic toe. (S1, ep 1) 7+.