USS San Diego Wreck

In July 1918, the 15,000-ton armored cruiser USS San Diego sank off Long Island, New York, losing six sailors from a crew of 1,200 after a mysterious explosion struck the vessel. She was later determined to have been sunk by a mine, laid by U-156.

The wreck rests upside down on a sandy sea floor. Maximum depth to the sand is 108 feet. The keel is beginning to collapse after a century underwater.