On July 26, 1945, the USS Indianapolis reached the island of Tinian, where it delivered the components and enriched uranium necessary for the atomic bomb Little Boy, which would soon devastate Hiroshima. But it's perhaps best known for its role in history's worst shark attack.
The Titanic sat undiscovered on the ocean floor for 73 years before Robert Ballard found it. The ocean keeps its secrets hidden tight. Here are four other great wrecks that await discovery on the ocean floor.