The USS Philadelphia (SSN 690) arrived at the Portsmouth Naval Shipyard for maintainance work that w...

Staff Photo by Doug Jones, Wednesday, February 15, 2006: The USS Philadelphia (SSN 690) arrived at the Portsmouth Naval Shipyard for maintainance work that will last about nine months. The 6,000 ton atomic submarine is 360 feet long with a beem of 33 feet. The 1977 Los Angeles- class attack submarine is captained by Cmdr, Jeffrey T. Jablon, of Frostburg , Maryland, and carries a crew of about 100. It was built in Groton , Conn. by General Electric Boat . (Photo by Doug Jones/Portland Press Herald via Getty Images)