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By scanning the locations at the bottom of the ocean where sunken ships, treasures and even cities lie, the show tries to answer what they look like, how they got there and if they hide any secrets.

Explore a world never seen before a world hidden under miles of water, the landscape of the seabed. Join expeditions to dive long-lost vessels, discover ancient sites and follow the scientists who are probing the darkest and deepest corners of this underwater world. Computer generated, three-dimensional maps and imagery will offer a first glimpse of these mysteries.

Port Royal, the 'wickedest city on Earth', famous for its Caribbean pirates, liquor, is torn apart on June 7th 1692 by quake and tsunami. Two thirds of buildings are sucked into the ocean, the rest buried where they sink. 2,000 die. Marine archaeologist Jon Henderson goes in search of what happened. Scientific data combines with computer graphics to DRAIN the waters to investigate final moments and resurrect past secrets.

Using cutting edge visual effects to 'drain' the waters around the notorious island of Alcatraz. With the waters drained away the secrets of Alcatraz are revealed, including exactly why the island's infamous prison was so inescapable. With no water in the way San Francisco Bay is revealed to be a fascinating and chaotic place. On the dry bay floor we see the scars left by epic earthquakes. These fault lines give scientists an idea as to when and where the next 'big one' will strike. With the whole area drained it's possible to see what could happen to San Francisco when the next giant quake hits, as well as what will be left of Alcatraz once the dust settles.

Computer-generated imagery and other visualization techniques reveal how it would look if all the water was removed from RMS Titanic's final resting place.

Divers, wreck investigators, and archaeologists, tell the stories of the final moments of ships and those on board. Examining the evidence in the wreckage, with state of the art CGI and the latest underwater technology, and combining it with powerful personal testimony, brings out the human side of these tragedies, as well as answering the questions of what happened and why.

Scientists and film makers take us to the bottom of the Great Lakes and show us what the bottoms are like and go back in history when they formed.

What lies beneath the mythical triangle? With the aid of data from sophisticated sonar surveys, National Geographic explores what the ocean floor looks like below the Bermuda Triangle.

25th April 1915 Australian Submarine AE2 enters the Sea of Marmara, Turkey while Anzacs storm the beachhead at Gallipoli. Now lying on the bottom of the sea a search team locates it and it's story is told.

World War II left the greatest-ever number of ships and submarines hidden beneath the waves. Now, as the oceans drain, each vessel reveals its secrets through new data-based 3D reconstructions. From the Arizona in Pearl Harbor's shallows, whose destruction brought America into the war, to Nazi supership, the Bismarck, and its mysterious end three miles down; from the flaming merchant ships secretly torpedoed by U-boats off tourist beaches of the USA, to the covert inventions of the Allies' costly D-Day beachhead, and lastly to the troopship Leopoldville sunk with the needless deaths of 400 soldiers hushed up - Drain exposes the truth.

Experts follow investigations to uncover new details about the most epic and infamous wrecks from history.

Britain and Ireland, island nations, have the richest of maritime histories. Thousands of vessels lie wrecked off their shores. Many sank in time of World War and are yet to be discovered.

Using the latest sonar technology, an expedition to map sunken Allied vessels off the Normandy Coast reveals stunning images from beneath the waves. There are over 100 shipwrecks in the English Channel of the landing craft and ships that took part in the greatest amphibious invasion fleet ever assembled.

The latest sonar technology reveals shipwrecks as never seen before. As water drains away, a secret beneath Manhattan's skyline, an earth-shattering feat of engineering, a record-breaking icon and a casualty of World War I stealth warfare are revealed. Examining these hidden giants can explain New York City's meteoric rise to a bustling world metropolis.

Using the latest sonar technology, hundreds of shipwrecks around the British Isles are uncovered as victims of World War II's German U-Boats, one of the world's first stealth weapons. Draining the oceans sheds light on this historical event as the secret technology deployed by Germany to sink ships and nearly bring the Allies to their knees is uncovered.

The land battles of the American Civil War are well known, but it's the war on the seas that shaped the outcome of the war. Maritime archaeologists and historians go in search of Civil War secrets, hidden deep underwater. Scientific data combines with computer graphics to drain the oceans to investigate the lost wrecks of the war.

When the world's two greatest superpowers vie for supremacy, they spur extraordinary advances in military technology. For nearly 50 years the United States and the Soviet Union engage in a monumental arms race known as the Cold War. Groundbreaking CGI allows us to Drain the ocean to reveal shocking evidence of secret nuclear confrontation.

Draining the ocean near Newfoundland reveals a preserved Basque galleon trading in lucrative whale oil. The Spanish empire relies on powerful ships like this to bring back valuable cargo, like silver and tobacco, from the New World. But when emerging rival England wants a share of this wealth, the Spanish attack. Draining an Armada wreck off the coast of Ireland reveals an extraordinary battle for control.

A high-tech expedition searches for the iconic wrecks of the Battle of the Pacific, including the aircraft carrier USS Lexington, and the ship that delivered the Hiroshima bomb, the USS Indianapolis. Funded by Microsoft co-founder Paul Allen, the expedition's discoveries reveal new evidence that helps explain some of the greatest mysteries of World War II at sea

The rescue of 12 boys trapped in the Tham Luang cave in Thailand was the most dangerous cave-diving rescue mission of all time. With unique access, Drain the Oceans conducts the first accurate 3D survey inside the cave. The data, combined with computer graphics, offers the first accurate visualization of how the boys were trapped and how they were saved.

London is one of the most iconic and powerful cities on Earth. But how did London, the center of a vast empire, once the undisputed capital of the English-speaking world, become so dominant? Through a series of astonishing maritime discoveries, Drain the Oceans reveals the secret story of the city's meteoric rise.

Drain the Oceans solves one of the world's great mysteries - the identity of the Loch Ness monster. Using comparisons with the deepest lake on Earth - Lake Baikal in Russian Siberia - combined with military-grade scanning technology and a sonar curtain drawn across its entire surface, the plug is pulled on Scotland's famous loch. As the waters drain away, much more than a monster is revealed.

Hitler's dream is to build an armada of state-of-the-art warships and take on the might of the British Royal Navy. But his plans to dominate the oceans slowly unravel in a series of disastrous battles. Drain the Oceans investigates the mysteries and reveals how the Third Reich's mighty fleet finally sank beneath the waves.

Hitler's latest weapons sink during a top-secret U-boat mission. An American aviation breakthrough brings victory to the Allies in the Pacific.

Archaeologists investigate a wreck that could be the last ever slave ship to bring Africans to American soil through the trans-Atlantic slave trade.