On a frigid April night in 1912, the world’s largest—and soon most famous—ocean liner struck an iceberg and slipped beneath the waves. She had scarcely disappeared before her new journey began, a seemingly limitless odyssey through the world’s fixation with her every tragic detail. Plans to find and raise the Titanic began almost immediately. Yet seven decades passed before it was found. Why? And of some three million shipwrecks that litter the ocean floor, why is the world still so fascinated with this one?