U.S. Nuclear Sub Runs Aground

About 400 miles south of Guam, a Los Angeles-class nuclear attack submarine, USS San Francisco, ran aground during submerged operations. The U.S. Navy reports that one sailor is critically injured. The boat is on the surface underway toward Guam, its home port, with no apparent damage to the reactor plant.

A simple look at the map indicates that the water in the described location is miles deep. It sure doesn't seem possible for a submarine to hit bottom unless there was an uncharted seamount or the sub was operating close to an island.