The largest ship afloat and reputed to be unsinkable left Southampton, England with 2,223 souls on board April 10, 1912. She sank 12,500 feet to the ocean floor early in the morning of April 15, 1912 off the coast of Newfoundland. 1514 people perished.
National Geographic has a photo gallery of artifacts and remnants of the ship as she lays on the ocean floor.
UPDATE: A number of people on Twitter just found out that the Titanic was an actual event and not just a movie. Where did they go to school? What do you bet most of them are Obama supporters?