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Stansted Crash: 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+

Mystery Meds: In San Juan the passengers try to smuggle elicit medication. (S1, ep 7) 7+

The Pursuit: Johnny searches for small game, Chris and Jessi's livelihood is threatened, Sonta and Sydney try to harvest a moose and the Millers go otter trapping. (S5, ep 5)

The King's Evil, the Leper Skull, Ancient Cancer Treatment: Ancient clues reveal how rulers, healers and early societies confronted disease. (S1, ep 10) 18+

Assassin's Gun: Sean estimates the value of a derringer pistol. Meanwhile, Shooter checks out a Captain America comic book that a fan went to great lengths to acquire. 7+

Night Shift: Wedding Cake & Roast Beef Wraps: As a baking crew struggles with a last-minute wedding cake order, a catering team races to feed hundreds of athletes. (S5, ep 23) 7+

Night Shift: Dogfish & Beets N' Corn: While a crew of fisherman tackle a mega order from Harvard University, two farmers scour their fields for super fresh veggies. (S5, ep 24) 7+

Elephants on the Edge: Mali is home to a rare tribe of elephants. They are one of just two herds of desert-dwelling elephants in the world. But they are struggling to survive. (S1, ep 7) 7+

Kings of the Canopy: Who says you need wings to fly? The best action is up high in Borneo's rainforest, where some animals go their whole lives without touching the ground. (S1, ep 8) 7+

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Runway Runoff: Clues point to a mechanical problem when a Continental Airlines flight crashes. But then, investigators find the true culprit in the Rocky Mountains. (S18, ep 7)

Lethal Limits: A series of discoveries spark calls to transform Russia's entire aviation system when an Aeroflot Nord flight crashed onto the Trans-Siberian railway. (S18, ep 8)

Three Mile Island, Mont Blanc Tunnel, Sampoong Mall: How did a nuclear reactor at Three Mile Island melt down? And how did a small truck fire become a lethal inferno? 7+. (3 of 8)

Lancia Delta Integrale: 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+

Hazards: 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+

Who's At The Controls? The pilots of an Eastern Airlines flight became concerned that their landing gear was not locked for landing. Did this distraction cause the plane to crash? 7+

Himmler's Folly: In a bid to support the Battle of the Bulge, Himmler launches a surprise offensive into France against nearly arrived, green US troops. (S4, ep 5)

Unravel the mysteries behind the Bermuda Triangle in this one-off documentary, which, for the first time, gets to the bottom of what lies beneath the sinister stretch of water. 7+

John Dudley: The Wicked Duke: Dan Snow and Suzannah Lipscomb trace John Dudley's rise to power and his pivotal role in Lady Jane Grey's brief reign. (S1, ep 5)

Marathon Mission: Thord and Bjoern are tested to the limits when they have to rescue a truck from falling into a lake. 7+ (S7, ep 1)

Wreck Of The Sunset Limited: An express train was derailed and 47 passengers killed after an Alabama towboat captain unknowingly bumped a rail bridge in thick fog. 7+

Power Play: When a turboprop crashes in Papua New Guinea, investigators uncover a deadly flaw in an aircraft used all around the world. (S22, ep 4) 7+

Origins Of The Holocaust: Previously unseen footage reveals how, as Nazi soldiers enjoy rest and recreation in Paris, Jews and Polish prisoners are forced into slave labour.

Deadly Escape: Wounded in the fight to break out from Normandy, Captain Matt Urban defies the odds and leads a daring charge against German forces. (S6, ep 4)

Hitler's megalomania led him to construct the ultimate deep-sea destroyer, the largest tank the world has ever seen and a fighter jet that inspired a revolution in aerial warfare. 7+

On Course to Disaster: In 1978, 146 passengers died when a PSA flight crashed into a Cessna. Who was responsible for the deadly crash that also killed seven people on the ground? 7+