SOKS

SOKS, or System Obnarujenia Kilvaternovo Sleda, is a nonacoustic submarine detection system created by the Soviet Union. SOKS functions by detecting radionuclides from the nuclear reactor in submarines, chemical signatures, and changes in the refractive index of water in the wake of submarines. It was first installed on the November-class K-14 submarine in 1969. SOKS was revealed in a document that was declassified in June 2017, written by the Central Intelligence Agency Directorate of Science & Technology.[1][2]

References
  1. "Intelligence Report: Soviet Antisubmarine Warfare: Current Capabilities and Priorities" (PDF). cia.gov. September 1972. Retrieved 2018-01-04.
  2. "How the Soviet Union Snooped Waters for Enemy Subs—Without Sonar". popularmechanics.com. Retrieved 2018-01-04. CIA's Directorate of Science & Technology
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