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. Air Date: Dec 9, 2018