A World War I era U.S. Navy submarine now rests quietly more than 1,300 feet (396 meters) below the Pacific, west of San Diego. The USS F-1 sank on 12/17/1917 after a collision during a training run, and 19 sailors died, according to Navyrecords.

A recent deep-ocean mission used modern tools to map the wreck in crisp detail, without disturbing it. The mission doubled as a training cruise for pilots and engineers who operate some of the most capable undersea vehicles in the world.

See full article by Jordan Joseph HERE