The episode presents footage and anecdotal evidence from people who claim to have had close encounters with the 1st, 2nd, 3rd, and even the 4th kind. Scientists and astronomers provide scientific reasons to rebuke these claims.

On Halloween 1994, an American Eagle ATR-72 suffered a loss of control and crashed near Roselawn, Indiana killing all 68 people on board. While flying in freezing conditions, ice accumulated on the wings. Inadequate de-icing mechanisms failed to remove the ice, resulting in the disruption of the airflow.

The episode presents footage and anecdotal evidence from people who claim to have had close encounters with the 1st, 2nd, 3rd, and even the 4th kind. Scientists and astronomers provide scientific reasons to rebuke these claims.

National Geographic Channel analiza la siniestra reputación del Triángulo de las Bermudas drenando virtualmente el agua de la zona para ver qué es lo que hay debajo de la superficie. Con ayuda de los datos proporcionados por un sónar sofisticado, se podrá observar la apariencia del fondo del océano en el Triángulo de las Bermudas.

Descubre que hizo posible que el rompehielos mas grande del mundo pudiera atravezar el hielo de mas de un metro y medio de espesor, pulverizando bloques de hielo del tamano de un coche con sus enormes propelas.

El metro de Londres es el sistema de metro más grande del mundo occidental, además de una auténtica obra maestra de la construcción subterránea, siendo usado por mas de 4 millones de personas cada dia. Descubre como 4 inventos clave ayudaron a convertir el London Underground en el metro mas grande del mundo Occidental.

Modern prisons are brimming with technology. Explore the inner workings and incredible stories behind four landmark prisons that allowed engineers to build safer, tougher and bigger prisons.

A lo largo de las selvas de Centroamérica se extiende una de las más grandes maravillas construidas por el hombre, el Canal de Panamá. Ahora, casi un siglo después de su inauguración, un ingente proyecto de ingeniería pretende duplicar su capacidad

Powering through the waters of the Caribbean, the Independence of the Seas is longer than New York’s Chrysler Building is tall and wider than the White House is long. The largest cruise liner in the world, this 18-deck leviathan cost some $800million to build and generates enough electricity through its six diesel-electric engines to power the city of Southampton. The Independence carries 4,370 passengers in unrivalled luxury, while some 1,360 staff work behind the scenes in the control rooms, kitchens and engine rooms. Nearly four million square feet of steel in the form of prefabricated blocks were required to build the ship, while hi-tech ‘azipod’ propulsion units and bow thrusters make it incredibly manoeuvrable for a vessel of its size. However, the Independence of the Seas was not built in a day. The 160,000-ton giant and the maritime engineers that designed it relied on a number of historic engineering achievements. ‘Big, Bigger, Biggest’ charts the technological developments that preceded the completion of the Independence, focusing on six iconic ships that embodied the advancements of their ages.

Continuing this week is the factual series that examines the evolution of modern engineering. This edition studies the leaps in structural technology that led to the development of the world’s largest free-standing dome – the Kyushu Oil Dome in Oita, Japan. Home to the J League football club Oita Trinita, the Kyushu Oil Dome measures over 270 metres across and stands at 20 storeys high. Made of steel, Teflon and titanium, the roof can open at the flick of a switch, and allows sunlight into the stadium below even when closed. The pinnacle of modern structural engineering, this gargantuan dome owes its existence to nearly 2,000 years of innovation.

China’s Canton Tower required great leaps in technology to build. Explore the way key historic towers like the Eiffel Tower and Washington Monument made these engineering breakthroughs possible.

Este documental analiza cómo ha sido posible llegar hasta el tren francés de alta velocidad a través de una serie de cuatro grandes hitos de la ingeniería

Descubre que hizo posible que el rompehielos mas grande del mundo pudiera atravezar el hielo de mas de un metro y medio de espesor, pulverizando bloques de hielo del tamano de un coche con sus enormes propelas.

El metro de Londres es el sistema de metro más grande del mundo occidental, además de una auténtica obra maestra de la construcción subterránea, siendo usado por mas de 4 millones de personas cada dia. Descubre como 4 inventos clave ayudaron a convertir el London Underground en el metro mas grande del mundo Occidental.

Modern prisons are brimming with technology. Explore the inner workings and incredible stories behind four landmark prisons that allowed engineers to build safer, tougher and bigger prisons.

A lo largo de las selvas de Centroamérica se extiende una de las más grandes maravillas construidas por el hombre, el Canal de Panamá. Ahora, casi un siglo después de su inauguración, un ingente proyecto de ingeniería pretende duplicar su capacidad

\'Sink the Bismarck!\'\' was the cry as British forces searched the Atlantic for the German navy\'s most powerful vessel. The pursuit ended on May 27, 1941, in a battle that plunged the Bismarck into waters nearly three miles deep, taking with it more than 2,000 lives. Almost half a century later, explorer and scientist Dr. Robert Ballard, who discovered the sunken Titanic, searched the Atlantic for the infamous Bismarck. On June 8, 1989, he located the sunken ship, 600 miles off the coast of France. National Geographic looks back at the first, and last, mission of the Bismarck and talks with survivors of the notorious World War II battle. Then, in its climatic chapter, the story reveals exclusive footage of this remarkable undersea exploration.

Utilizando la descripción de la Atlántida que hizo Platón, tres equipos de arqueólogos intentan demostrar que la legendaria ciudad perdida existió de verdad. Según el investigador norteamericano Richard Freund, parte de la Atlántida podría ser el territorio del suroeste de España que hoy ocupa la provincia el coto de Doñana y habría sido destruida por un tsunami.

James Cameron y Simcha Jacobovici van a la aventura de encontrar la ciudad perdida de Atlantis utilizando al filósofo griego Platón como un mapa del tesoro virtual.

Port Royal, Jamaica, home to the real Pirates of the Caribbean. Once the world\'s wickedest city - until an earthquake swept into the sea. Now a dive team is using new technology to bring the sunken city to life; and to walk in the footsteps on pirates.