Nat Geo HD Schedule, Today (United Kingdom)

Coke, Cakes and Cash: HSI pursues a case of cocaine-filled cakes across state lines, and CBP seizes more than $100,000 of undeclared currency. (S2, ep 5). 12+.

Lost Flights: Join the search to solve the world's greatest aviation mysteries. Can using the latest scanning technology help find these lost flights? U. (S4, ep 5)

Philadelphia Ame Church: The team hit the jackpot in an abandoned church, finding a Tiffany-style stained glass window and the remains of a basement bowling alley. (S1, ep 12)

Ice Cup of Tea: Get a look inside the making of Cherry Garcia ice cream, Earl Grey Tea and lollipops! Suitable for all audiences. All ages.

Get Fruity: Take a look at how gigantic batches of some of your favourites are made, from fruit candy to chicken soup! Suitable for all audiences. All ages.

The Gun Sword: Sean meets a man who spent his childhood unwittingly playing with an incredibly valuable toy. He also finds a veteran who owns one of his favourite weapons. All ages.

Special Ops: Shooter hits the range with an MP5 sub-machine gun. Plus, Jim gets his hands on a Colt .45 that allegedly belonged to Buffalo Bill. Can he prove it's real? All ages.

Here We Goat Again: An adorable goat named Dexter has blood in his urine. Dr K suspects a urinary infection and wants to take an ultrasound to see what's going on. RATING: NU7 (S1, ep 10)

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. RATING: NU12 (S1, ep 11)

Teleshopping.

Teleshopping.

Teleshopping.

Teleshopping.

Teleshopping.

Over the Rainbow: A look at how rice and sugar are transformed into gooey marshmallow bars. Plus, a look at how many microscopic layers are baked into flaky dough. (S2, ep 20) RATING: AA

Put the Kettle On: Discover how crispy Kettle potato chips are specially crinkled for maximum dipping power. Plus, how meringue cookies get their delicate texture. (S2, ep 21) RATING: AA

Greek Islands: Uncover the beauty of the Santorini skyline, Corfu's Venetian fortress and a summer festival with a fiery twist on the island of Spetses. 7+. (2 of 6)

Terror In San Francisco: Experts are forced to confront a controversial issue as they dig into the fate of Asiana Airlines Flight 214 which crashed into a seawall in 2013. RATING: AA

Explosive Proof: Authorities suspect a terror attack when a plane explodes after taking off from JFK. The FBI joins investigators in their search for answers. (S16, ep 4) Rating: All ages

Disaster at Dutch Harbor: Investigators struggle to explain why PenAir 3296 failed to stop after landing at a famously tricky Alaskan airport - until they uncover the truth. U. (7 of 10)

VW Wizard: The hosts come to the rescue of their first ever-custom car: a radically modified VW Beetle called a VW Wizard. Suitable for all audiences. (S9, ep 3)

Jensen Interceptor: Tim and Fuzz are off to Southampton to take on a 1969 Jensen Interceptor. The owner adored the car until he got extreme arthritis. Suitable for all audiences.

Dennis Fire Engine: Tim and Fuzz are off to Kent to rescue a 1973 Dennis Fire Engine belonging to firefighter James, who recently lost his father to cancer. All Ages. (S10, ep 7)

Paris Train Crash: The worst rail disaster in French history happened on 27 June 1988, when an out of control train careered into a packed Gare de Lyon platform. How did it all go wrong?

Vanished: They disappeared without a trace or a soul to tell their tale. Shipwrecks so mysterious, their fate became the stuff of legends, until now. U. (S4, ep 3)

Mystery of the Great Flood: 6000 years ago, the Sumerians built the world's first cities.

Secrets of Nineveh and Babylon: Nineveh and Babylon were superpowers of the ancient world, so why did the Bible's writers see them as cities of sin? What were they really like? U. (2 of 2)

Executions: A look at infamous executions in the Tower of London, including the botched beheading of Charles II's son, whom it took five strikes of the axe to kill. (2 of 3) RATING: NU12

Traitors: Joe Crowley and Tudor historian Dr Suzannah Lipscomb delve into the Tower of London's bloody past, starting with the grisly fate of traitors. (1 of 3) RATING: NU12

Scandal!: A look at the Tower of London's high-profile prisoners, such as Anne Boleyn and the tragic tale of lovers William Seymour and Lady Arbella Stuart. (3 of 3) RATING: AA

Experts investigate the fate of Port Royal. Known as 'the wickedest city on Earth', it was a famous hangout for pirates until an earthquake and tsunami sucked it into the ocean. All ages.