The Sound Surveillance System (SOSUS) was a passive sonar system developed by the United States Navy to track Soviet submarines. The system's true nature was classified with the name and acronym SOSUS themselves classified. The unclassified name Project Caesar was used to cover the installation of the system and a cover story developed regarding the shore stations, identified only as a Naval Facility (NAVFAC), being for oceanographic research. In 1985, as the fixed bottom arrays were supplemented by the mobile Surveillance Towed Array Sensor System (SURTASS) and other new systems were coming on line, the name itself changed to Integrated Undersea Surveillance System (IUSS). The commands and personnel were covered by the "oceanographic" term until 1991 when the mission was declassified. As a result, the commands, Oceanographic System Atlantic and Oceanographic System Pacific became Undersea Surveillance Atlantic and Undersea Surveillance Pacific, and personnel were able to wear insignia reflecting the mission.
The Naval Undersea Warfare Center (NUWC) is the United States Navy's full-spectrum research, development, test and evaluation, engineering and fleet support center for submarines, autonomous underwater systems, and offensive and defensive weapons systems associated with undersea warfare. It is one of the corporate laboratories of the Naval Sea Systems Command. NUWC is headquartered in Newport, Rhode Island and has two major subordinate activities: Division Newport and Division Keyport in Keyport, Washington. NUWC also controls the Fox Island facility and Gould Island. It employs more than 4,400 civilian and military personnel, with budgets over $1 billion.
The SOFAR channel, or deep sound channel (DSC), is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum. The SOFAR channel acts as a waveguide for sound, and low frequency sound waves within the channel may travel thousands of miles before dissipating. An example was reception of coded signals generated by the Navy chartered ocean surveillance vessel Cory Chouest off Heard Island, located in the southern Indian Ocean, by hydrophones in portions of all five major ocean basins and as distant as the North Atlantic and North Pacific.
Fort Miles was a United States Army World War II installation located on Cape Henlopen near Lewes, Delaware. Although funds to build the fort were approved in 1934, it was 1938 before construction began on the fort. On 3 June 1941 it was named for Lieutenant General Nelson A. Miles.
Naval Station Argentia is a former base of the United States Navy that operated from 1941 to 1994. It was established in the community of Argentia in what was then the Dominion of Newfoundland, which later became the tenth Canadian province, Newfoundland and Labrador.
Ramey Air Force Base is a former United States Air Force base in Aguadilla, Puerto Rico. It was named after United States Army Air Forces Brigadier General Howard Knox Ramey. Following its closure, it was redeveloped into Rafael Hernandez Airport.
Naval Facility Bermuda, or NAVFAC Bermuda, was the operational shore terminus for one of the Atlantic Sound Surveillance System (SOSUS) array systems installed during the first phase of system installation and in commission from 1955 until 1992. The true surveillance mission was classified and covered by "oceanographic research" until the mission was declassified in 1991. The system's acoustic data was collected after the facility was decommissioned until the system was routed to the central processing facility, the Naval Ocean Processing Facility (NOPF), Dam Neck, Virginia in 1994.
Project Artemis was a United States Navy acoustics research and development experiment from the late 1950s into the mid 1960s to test a potential low-frequency active sonar system for ocean surveillance. The at sea testing began in 1960 after research and development in the late 1950s. The project's test requirement was to prove detection of a submerged submarine at 500 nmi. The experiment, covering a number of years, involved a large active element and a massive receiver array.
USNS Neptune (ARC-2), was the lead ship in her class of cable repair ships in U.S. Naval service. The ship was built by Pusey & Jones Corp. of Wilmington, Delaware, Hull Number 1108, as the USACS William H. G. Bullard named for Rear Adm. William H. G. Bullard. She was the first of two Maritime Commission type S3-S2-BP1 ships built for the US Army Signal Corps near the end of World War II. The other ship was the Albert J. Myer, which later joined her sister ship in naval service as the USNS Albert J. Myer (T-ARC-6).
RV Sir Horace Lamb was a Navy owned former mine warfare vessel assigned to the Columbia University, Geophysical Field Station research facility in Bermuda for acoustic research operating from 1959 to 1976. The ship was the former USS Redpoll (AMS-57/YMS-294), a YMS-1-class minesweeper of the YMS-135 subclass built and commissioned as YMS-294 in 1943.
Naval Facility Nantucket Island or simply Naval Facility Nantucket was a shore terminal of the Sound Surveillance System (SOSUS) active from 1955 to 1976. The true function of the system and the shore terminals, in which output of the array at sea was processed and displayed by means of the Low Frequency Analyzer and Recorder (LOFAR), was classified and the term "Naval Facility" was intentionally vague. Its function was described as oceanographic research.
Naval Facility (NAVFAC) Barbados, TWI, in commission 1957 to 1979, was the most southern of the Atlantic Sound Surveillance System (SOSUS) shore terminals. It had the distinction making the first system detection of a Soviet nuclear submarine in 1962 as that submarine was transiting off Norway. The facility was located adjacent to the Harrison Point Lighthouse, Parish of Saint Lucy.
USS Allegheny (ATA-179) was an American Sotoyomo-class auxiliary fleet tug launched in 1944 and serving until 1968. She underwent conversion to a research vessel in 1952.
Canadian Forces Station (CFS) Shelburne is a former Canadian Forces Station that was a shore terminus for the Sound Surveillance System (SOSUS) from 1955 to 1994. It was located in the Municipality of the District of Shelburne, Shelburne County, Nova Scotia.
Naval Air Facility Adak, was a United States Navy airport located west of Adak, on Adak Island in the U.S. state of Alaska. After its closure in 1997, it was reopened as Adak Airport. The facility was designated a National Historic Landmark for its role in World War II, although most of its elements from that period have been demolished or lie in ruins.
Naval Facility Cape Hatteras was a Sound Surveillance System (SOSUS) shore terminal, one of the nine initial systems installed, located on Cape Hatteras near Buxton, North Carolina and adjacent to the old location of the Cape Hatteras lighthouse. NAVFAC Cape Hatteras, eighth of the initial nine Atlantic systems to be activated, was in commission 11 January 1956 to 30 June 1982.
Naval Facility Point Sur was one of 30 secret sites worldwide that were built during the Cold War to detect Soviet submarines. In 1958, the U.S. Navy built a Naval Facility (NAVFAC) ½ mile south of Point Sur on the Big Sur coast to provide submarine surveillance using the classified SOund SUrveillance System (SOSUS). The public was told the station was engaged in oceanographic research.
In 1958 Naval Facility (NAVFAC) Centerville Beach was the third Sound Surveillance System (SOSUS) shore terminal, in which output of the array at sea was processed and displayed by means of the Low Frequency Analyzer and Recorder (LOFAR), established on the Pacific coast. The previous year the last of the original Atlantic systems, Naval Facility Barbados, had become operational and the first of the Pacific systems had been installed at San Nicolas Island. Naval Facility Point Sur to the south had been commissioned on 8 January 1958. The SOSUS mission, as well as the name itself was classified until 1991. The facility was installed under the cover name Project Caesar and described as being engaged in "oceanographic research" with its actual role in undersea surveillance not revealed until two years before the facility closed.
Two closely related terms, Low Frequency Analyzer and Recorder and Low Frequency Analysis and Recording bearing the acronym LOFAR, deal with the equipment and process respectively for presenting a visual spectrum representation of low frequency sounds in a time–frequency analysis. The process was originally applied to fixed surveillance passive antisubmarine sonar systems and later to sonobuoy and other systems. Originally the analysis was electromechanical and the display was produced on electrostatic recording paper, a Lofargram, with stronger frequencies presented as lines against background noise. The analysis migrated to digital and both analysis and display were digital after a major system consolidation into centralized processing centers during the 1990s.
The Missile Impact Location System or Missile Impact Locating System (MILS) is an ocean acoustic system designed to locate the impact position of test missile nose cones at the ocean's surface and then the position of the cone itself for recovery from the ocean bottom. The systems were installed in the missile test ranges managed by the U.S. Air Force.
