On the night of April 14, 1912, as it made its first voyage, the luxury steamship Titanic struck an iceberg. Then, a few hours after midnight on April 15, the ship sank thousands of feet before settling on the ocean floor. And that s where it stayed, whereabouts unknown, for the next 73 years until it was discovered by oceanographer Robert Ballard and his crew. The pictures and video Ballard brought back from the 1985 discovery helped stir new interest...

"In 1985, Oceanographer Bob Ballard went searching for the most famous shipwreck of all time. Explorers, including Ballard, had been looking for the ship for years without luck. But on this voyage, the team had Argo, a deep-sea vehicle with a remote-controlled camera to help with the search. For days, the team pulled Argo across the ocean floor and found nothing. They were beginning to lose hope. Then, on September 1, something appeared on their...