As submarine operations increasingly move into coastal waters, the risk of submarine close encounters increases, as does the vulnerability of the platform to advanced threat weapons systems. A hard-kill terminal defense system would provide an effective response against these close-in threats. This system must detect. classify and localize a potential threat. aim an underwater gun, and launch a very high-speed projectile towards a target to neutralize it. To deliver enough kinetic energy to the target without enormous parasitic drag requires unconventional methods -- supercavitation technology.

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