Submarines continue to play an important role in covert electronic surveillance. Submarines remain a highly prized asset for ISR collection because their stealth capabilities enable access to non-permissive areas close to shore that cannot be reached by other means. Operated by a proficient crew, and maintaining an enduring presence in-theatre, a submarine can host multiple sensors, maintaining 'eyes and ears' on activity in the air, surface and/or sub-surface battlespace. They also serve as an important intelligence 'force multiplier,' providing tip-offs of high-interest events to other collection assets. Since submarines are able to conduct persistent operations in areas inaccessible to other platforms or systems, they are uniquely positioned to intercept signals of critical tactical, or even strategic, importance, furthermore, the ability to loiter covertly and 'listen' for extended periods defeats the efforts of an adversary or belligerent to evade or deceive collection by satellites and other sensors.
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