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An NH-90 naval helicopter intercepts a fleeing drug boat, as the Metal Shark crew attempts to save undocumented migrants from a sinking boat. 7+.

A closer look at three air tragedies reveals what happens when commercial planes get caught in the heat of war. (S1, ep 5) 7+.

Dark secrets resurface as the series hunts deep below the waves for evidence of North America's history of dinosaurs, trade, slavery and war. (S1, ep 3) 7+.

Etruscan Mummy: Did a 200-year-old mechanical man really beat the world's best chess players? Who made it, and how does it work? (S3, ep 9) 7+.

Lac-Mégantic train crash, Imperial Sugar refinery explosion, Ever Given container ship accident. (6 of 8) 7+.

Tim and Fuzz take on a Mercedes SLK with huge sentimental value for owner Lili, but this stylish roadster hides major mysteries. (2 of 10) 7+.

Moments after taking off from the Norwegian island of Vaeroy, a turboprop plunges into the North Atlantic. (8 of 10) 7+.

The story of how Nazi engineers responded to Hitler's megalomaniac vision by building some of the largest tanks and land battleships. 7+.

It was the largest and most celebrated airship ever built, but on 6 May 1937 it caught fire, killing 36 passengers and crew. What caused the tragedy? 7+.

Tim and Fuzz secretly fix up Italian car nut Gary's rusty World rally champ.But when tragedy strikes, the job takes on a very different meaning. 7+.

Lightning has struck an incoming flight. As engineers assess the damage, high winds lead to runway closures and another plane starts leaking a potentially dangerous liquid. 7+.

A look at the fate of Korean Air Cargo flight 8509. 4 died in the explosion near Stansted Airport, making it the airline's fifth accident in two-and-a-half years. 7+.

Tim and Fuzz leave four wheels behind to tackle the ambitious restoration of a 1973 Triumph Bonneville motorbike, belonging to ex-postmaster Ian. (S14, ep 3) 7+.

Presenter Tim and master mechanic Fuzz whisk a Ford Anglia from its garage in Bournemouth. Can they surprise owner James with their secret motor makeover? 7+.

Margot, caught off guard by an unplanned litter of puppies, prepares to leave her Yukon trapline early. Billy embarks on a backwoods salvage mission.

Terrorists claimed responsibility when Metrojet 9268 broke up in the air after leaving Sharm el Sheikh. But can experts prove what really happened? (S16, ep 5) 7+.