Keywords: US Navy 090831-N-8467N-002 The Los Angeles class submarine USS Helena (SSN 725) gets underway from Submarine Base New London.jpg en GROTON Conn Aug 31 2009 The Los Angeles class submarine USS Helena SSN 725 gets underway from Submarine Base New London to Portsmouth Naval Shipyard in Kittery Maine The San Diego Calif based submarine will be undergo extended maintenance including several system upgrades over the next 18 months U S Navy Photo by John Narewski/Released 2009-08-31 090831-N-8467N-002 Navy http //www navy mil/view_image asp id 76102 U S Navy Photo by John Narewski PD-USGov-Military-Navy Naval Submarine Base New London |