by Christina Larson

WASHINGTON — A hundred years ago, a mysterious explosion hit the only major U.S. warship to sink during World War I. Now the Navy believes it has the answer to what doomed the USS San Diego: An underwater mine set by a German submarine cruising in waters just miles from New York City.

That’s the conclusion of an investigation by scientists, archaeologists and historians convened by the U.S. Naval History and Heritage Command. Last summer, the researchers sent an unmanned underwater vessel to inspect the site off New York’s Long Island. Their analysis ruled out a torpedo and sabotage, two other possible scenarios.

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