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Titanic

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Shipwrecks and the tantalizing allure of the sea

Shipwrecks have long fascinated oceanographer Robert Ballard, who became renowned for locating the wreck of the RMS Titanic in 1985. He talks with correspondent Lee Cowan about how that discovery 12,000 feet beneath the Atlantic changed him, and about the efforts of his research vessel Nautilus to map the ocean floor. Cowan also talks with Sophie Elmhirst, author of the bestseller "A Marriage at Sea: A True Story of Love, Obsession, and Shipwreck," about human beings at their most vulnerable.

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Titanic: The untold story

In 1985 a top-secret Cold War search for two missing Navy submarines in the Atlantic would lead to discovering the final resting place of RMS Titanic, the luxury liner that sunk on April 15, 1912, with more than 1,500 souls aboard. Chip Reid visits an exhibition at the National Geographic Museum in Washington, D.C., about the search for the fated Titanic, and talks with Robert Ballard, the man whose classified hunt for the USS Scorpion and USS Thresher – nuclear submarines lost in the 1960s – would bring him to the most famous shipwreck in history.

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