Mark 60 CAPTOR
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The Mark 60 CAPTOR (Encapsulated Torpedo) is the United States' only deep-water anti-submarine naval mine.[1][2][3] It uses a Mark 46 torpedo[3][2] contained in an aluminum shell that is anchored to the ocean floor.[3] The mine can be placed by either aircraft, submarine or surface vessel.[3][2] The torpedo, once placed, can last anywhere from weeks to months underwater.[2] The original production contract of the CAPTOR mine was awarded to Goodyear Aerospace in 1972, and entered service in 1979.[2] It was hoped to reduce minefield costs and used in the creation of a barrier of the "Greenland-Iceland-United Kingdom gap to interrupt Soviet submarines in the event that deterrence failed."[1]
The mine uses Reliable Acoustic Path (RAP)[3][4] sound propagation to passively identify and track the difference between hostile submarine signatures, surface vessels and friendly submarines.[2] Once identified, the torpedo leaves its casing to destroy its target.