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- 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 (580 mi; 930 km). The experiment, covering a number of years, involved a large active element and a massive receiver array. The receiving array was a field of modules forming a three dimensional array laid from 1961 to 1963 on the slopes of a seamount, the Plantagenet Bank (31°59′00″N 65°11′00″W / 31.983333°N 65.183333°W), off Bermuda. The modules, attached to ten lines of cable, were 57 ft (17.4 m) masts with floats on top to keep them upright. Each module mounted sets of hydrophones. The receiving array terminated at Argus Island, built on the seamount's top, with data processed at the laboratory that was also constructed for the project. The laboratory was then the Bermuda Research Detachment of the Navy Underwater Sound Laboratory. The active source array was to be suspended at 1,000 m (3,280.8 ft) to 1,050 m (3,444.9 ft) from the former tanker Mission Capistrano. The 1440-element active array had a one megawatt acoustic output (180 dB) with a center frequency of 400 Hz. Though Artemis failed the final test and resulted in no operational system, it set the agenda for research in ocean acoustics and engineering such systems for the future. (en)
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