MARLBOROUGH, Mass. --- The U.S. Navy has successfully conducted the first large-scale test of Raytheon Company's Deep Siren tactical paging system.>> Deep Siren enables operational commanders anywhere in the world to contact a submerged submarine, regardless of its speed or depth. This capability solves one of the most significant shortfalls in submarine communications.>> Raytheon's Deep Siren system employs acoustic, expendable buoys that, when contacted through the Global Information Grid, enable long-range communications.>> "Deep Siren is a critical technology for the Navy's first generation of undersea FORCEnet communications efforts," said Jerry Powlen, vice president, Network Centric Systems' Integrated Communications Systems. "Employing this technology enables the submarine fleet to be connected to the network while actively participating in military operations.">> In April 2008, the Navy began a comprehensive test of the Deep Siren tactical paging system for the Navy's Communications at Speed and Depth program. Initial testing demonstrated successful results when the Deep Siren buoy was deployed over the side of a surface vessel.>> In June, a Navy submarine deployed 12 Deep Siren communications gateway buoys at the Atlantic Undersea Test and Evaluation Center deep water range in the Bahamas. The buoys successfully reached the surface establishing direct connectivity between the commander of the Submarine Force test team in Norfolk, Va., and the submarine.>> In August, the Operational Test and Evaluation Force conducted the final test event, a military utility assessment, when a Navy submarine successfully deployed Deep Siren buoys. With successful test results, Raytheon is ready to move forward to production.