The Navy yesterday released photographs of the shredded bow of a nuclear submarine that ran into an undersea mountain earlier this month, and officials said they were still assessing the extent of the damage. The photos were taken once the submarine, the San Francisco, limped back to Guam after smashing into the mountain, which was not on its navigational charts. The photos show that the head-on crash 500 feet below the ocean's surface destroyed a sonar dome that formed the submarine's nose and peeled back part of the outer hull. The accident, which killed one sailor and injured 60 others,...