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Tug O' War: At Türkiye's Sanmar Shipyards, engineers test powerful electric tugboats built to guide the world's largest ships safely into port. (S1, ep 4) 7+

Running on Empty: Air Tahoma Flight 185, a late-night cargo flight from Memphis, is on final approach to Cincinnati. (S24, ep 10 of 10) 7+

Search and Seize: An illegal stockpile is found in Algeciras, a group are caught out by a dangerous tide in Vizcaya and an investigation yields shocking results in Huelva. (S2, ep 8) 7+

Weed in, Weed out: Border Patrol scans the interstate for smugglers and stops a suspect who flees arrest. CBP seizes large amounts of inbound and outbound marijuana. 7+. (2 of 8)

Break The Bank: On the hunt for precious metals, Dave gets his hands on some old gold mining equipment, Rich gets a lead on an old building and Diego meets a tattoo artist. 7+

Itchy Trigger Finger: Sean and his crackerjack team of military experts evaluate a medieval joust, a 17th century rapier, and two guns that don't appear to have triggers. 7+

Hitler's Buzzsaw: Adrian finds and fires a German machine gun, capable of shooting up to 1,500 bullets per minute. Hammer unearths some amazing letters from the Civil War. 7+

Hitting The Trail: Discover how 9.7 billion cups of Danone's Activia yogurt are made every year, and why timing is everything when making veggie burgers. (S1, ep 26) 7+

Salty and Sweet: Discover how decadent doughnuts, rich and silky ice cream, spicy hot Korean kimchi, and flaky kosher salt gets to the masses. (S2, ep 1) 7+

Teenage Mutant Leopard Turtle: Dr T treats Leo, a tiny leopard tortoise who is having trouble breathing, and Dr K meets Romeo, a Nigerian Dwarf goat who won't pee. (S1, ep 11)

Girl Nest Door: Paco the sun conure has a giant egg that won't come out. Jimmy Dean the baby pig comes in with his dog best friend, who has a suspicious lump. (S1, ep 12) 7+

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Seconds From Touchdown: Facing a cascade of failures and an engine fire, a turboprop is just seconds from the tarmac in Montreal when it flips over and crashes to the ground. 7+

Deadly Delivery: Facing poor visibility, a cargo flight is on final approach to an Alabama airport when it hits a grove of trees and crashes. What went wrong? 7+

Pacific Plunge: When Alaska Airlines Flight 261 suddenly nosedives into the Pacific, investigators uncover a critical maintenance issue. (S21, ep 5) 7+

Typhoon Takeoff: Experts delve into the fatal crash of Singapore Airlines Flight 006. They originally blamed severe winds then they found strange markings on a closed runway. 7+

Critical Flaw: Experts use 3D graphics and forensic analysis to uncover the causes of the 737 Max crash, Kielland rig disaster and Notre-Dame fire. (S2, ep 2) 7+

The Hindenburg: 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+

World War Two left a great number of ships and submarines hidden beneath the waves. If the oceans were drained, what secrets would each vessel reveal? 7+

Investigation into the mysterious disappearance of Nazi submarine U-745 which vanished in 1945. The frozen body of its captain was found on Foglo island. But what had happened? 7+

Dr Robert Ballard dives into Turkish waters to discover the ships and submarines wrecked during the bungling of the WWII Gallipoli campaign and the heroic stories of their crews. 7+

Deadly Go Round: Investigators examine the debris of China Airlines Flight 140, which crashed into the ground at Japan's Nagoya Airport in 1994. (S17, ep 9) 7+

Lethal Turn: 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+

DC-3: See how the DC3 reshaped flight in the 1930s and returned as the C47 in World War Two, delivering allied victories from Europe to the front lines. (5 of 5) 7+

Ford Model A: Tim and Fuzz do up a 90-year-old Ford in a secret bid to surprise its owner Craig, whose life was turned upside down by a terrible motorcycle accident. (S7, ep 5)

VW T4 Campervan: The boys pick up a 1991 VW T4 Campervan. Its owner has recently suffered with cancer and his wife hopes the car will bring some light into his life. (S7, ep 7) 7+

United Kingdom: The UK's engineering wonders revealed: including innovative electric flying machines, ingenious skyscrapers and a mega-stadium with a historical twist. (1 of 6) 7+

Nazi Fortress: The Allies target the Nazi-held port of Brest. But when flame-throwing tanks fail, it takes an explosive solution to bring down the fort's walls.