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Staff deal with a stranded family who are unable to pay a huge excess baggage fee. Elsewhere, suspicions are raised by two tennis balls found inside a package. (S3, ep 6) 7+

Firebomber Down: 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+

Lost Battalion: The story of the Lost Battalion - the American troops whose mission to liberate St Malo saw them trapped behind enemy lines, with devastating consequences.

Underground Cities and Secret Chambers: From underground churches to carved sacred chambers, hidden sites show how ancient communities created refuges for faith. (S1, ep 1) 7+

The Lost Cities of Alexander the Great: Alexander the Great's legacy is explored through new discoveries and a chilling find in Egypt. (S1, ep 6) 7+

Deadly Descent: Thord and Bjoern join forces when a truck threatens to tip down a hill and Thord's daughter, Malin, heads out to rescue a van but fails to reach it. (S10, 1 of 8) 7+

Hitler's Megafortresses: Built to hold back the Allies, Hitler set up colossal defences across Norway's coast and lines that stretched across the entire Italian peninsula. 7+

Cockpit Killer: Rangers discover the wreckage from a missing plane. After ruling out a host of possible causes, investigators come to a chilling conclusion. (S19, ep 9) 7+

France: In 1944, the Allies stormed Normandy to take Hitler's Europe, while France endured the devastation of total war on its own soil. (1 of 4)

Belgium and the Netherlands: Colourised footage and eyewitness accounts show the price paid by troops and civilians to liberate Belgium and the Netherlands from Nazi rule. (2 of 4)

747: Boeing set out to build the world's largest passenger jet. Discover the innovation, setbacks and risks behind the iconic 747. (S1, ep 4) 7+

Explosive Evidence: When Air India Flight 182 disappeared from the radar, controllers were left baffled. Investigators later discovered a sinister reason for the deadly crash. 7+

Fix to Fly: The work never slows at Sydney Airport, whether it's changing a wind sock, painting a runway at midnight or putting out a potentially catastrophic fire. (S1, ep 9) 7+

Spring Cleaning: With spring approaching, the Sarvelas attempt to save their garage from the unrelenting ocean below. Plus, the Browns repair their greenhouses. 12+. (S7, ep 1)

The Cash Factory: The destruction of an old paper mill proves a demolition nightmare for the Danley crew. Can they salvage enough to make it worth their while? 7+

Amazon Mafia: Mariana journeys into the Amazon rainforest to expose the criminal networks responsible for a slew of recent killings and illegal destruction of the jungle. (S1, ep 3) 18+

Fish Pirates: Few Americans realise 30% of their seafood has been caught illegally. Mariana finds out who makes billions each year while destroying our oceans. (S1, ep 4) 18+

Pop Goes the Cake: Get an insider's look at the making of ice cream cake and tartar sauce, and discover how slabs of cake become bite-sized cake pops. (S4, ep 1) 7+

Gold Bars: Get an insider's look at the making of polenta crisps, Alfredo risotto, Caribbean-inspired candy bars, and maple Danish pastries. (S4, ep 2) 7+

A Flying Fox!: The entire zoo is on baby watch as Phoebe the elephant goes into labor. Meanwhile, a family of flying foxes get their annual exam. (S1, ep 11) 7+

Good News Bears: The Columbus Zoo's new resident, a polar bear named Lee, arrives in Ohio and must get through quarantine. (S1, ep 12) 7+

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Death In The Arctic: Mid-air hijack? Mechanical breakdown? Pilot error? Follow aviation experts as they dissect this mysterious case. (S13, ep 10) 7+

Malaysian 370: What Happened?: In this special episode, examine one of the greatest aviation mysteries of all time - the disappearance of Malaysia Airlines Flight 370. 7+

Vikings Return: 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+

Renault Alpine 110: The hosts pick up one of France's most legendary rally racers: A 1972 Renault Alpine 110. The car has never been driven by it's owner, Guido. (S9, ep 7) 7+

When a plane arrives late, Gemma gets just one hour to unload its cargo, which includes 20 tonnes of flowers. (S3, ep 7) 7+

Powerless Plunge: Just moments after takeoff, a Loganair cargo flight from Edinburgh loses both engines and crashes into the icy North Sea. (S24, 4 of 10) 7+

Island of Fire: While the Canadian troops distracted German forces, the Allies mounted an amphibious assault on the last Nazi stronghold guarding Antwerp port - Walcheren Island. (S2, ep 2)

747: Boeing set out to build the world's largest passenger jet. Discover the innovation, setbacks and risks behind the iconic 747. (S1, ep 4) 7+

Pyramid Tomb Raiders: Discover how robbers looted the pyramids and tombs of ancient Egypt, and what clues they left behind. (S3, ep 7) 7+

Stormstruck: Thord must put his new rotator truck to the test when a tractor crashes down a hill and turns wheels up. (S10, 2 of 8) 7+

As US forces spread across the Pacific, Japan threw suicide bombers into action, built the world's biggest battleship and started building deep beneath Okinawa. 7+

Stormy Cockpit: Investigators uncover an alarming list of issues that caused a brand-new Kenya Airways plane's fatal crash into a mangrove swamp. (S19, ep 10) 7+

The Lost Cities of Alexander the Great: Alexander the Great's legacy is explored through new discoveries and a chilling find in Egypt. (S1, ep 6) 7+

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

Queen Anne's Revenge, Tribal Trepanation, Thunderbolt: Explore bizarre sea cures and the ancient skull-drilling practice of trepanation. (S1, ep 6) 18+

The Plane That Wouldn't Talk: Relive the tragedy of an unresponsive Boeing 737 that was brought crashing into the ocean off Santo Domingo by a rogue insect nest. 7+