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Have submarines become undetectable by passive sonar?

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In my knowledge, the reality is quite the opposite. Passive sonar, in principle, 'listens' to sounds underwater. As opposed to active sonar, it does not send out any 'pings', i.e. it does not use echolocation to detect targets. read more

However, passive sonar detects the sound made as the target travels through the water, that includes the sounds of the propellers, onboard equipment, the disturbances created in the wake of the target and so on. Therefore, passive sonar is effective at detecting submarines. read more

Submarines are not undetectable. Passive sonar (listening devices, essentially) can pick up the sound of submarine engines, and a lot of modern submarines use nuclear-powered turbines, which cannot be turned off. However, a number of submarines used by various navies around the world still use the old diesel-electric engines. read more

Submarines and mines truly undetectable to active sonar might become a reality soon. Discussion in 'Navy' started by plawolf, Jul 22, 2011. read more

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