For 73 years, people had wondered what really happened to the Titanic. There were theories, but all of them had yet to be proved because no one had found and explored the remains of the once giant and luxurious ocean liner. That is, until 1985. American ocean explorer Robert Ballard teamed up with French Jean-Louis Michel to try to find the shipwreck of the Titanic. What many people don't know is that Ballard was part of a top secret mission for the U.S. Navy to find something entirely different. Find out what Ballard was really looking for and how he discovered the Titanic.