1945: The USS Indianapolis leaves San Francisco with parts for the atomic bomb "Little Boy" bound for Tinian Island. This would be the last time the Indianapolis would be seen by the mainland as she was torpedoed and sunk by the Japanese Submarine I-58 on July 30. Of her 1,196 crewmen, about 900 survived the sinking. The survivors faced exposure, dehydration and shark attacks while waiting for assistance while floating with few lifeboats and almost no food or water. When they were rescued four days later, only 316 had survived.