Acoustic mine
Mine that monitors acoustic activity for potential targets / From Wikipedia, the free encyclopedia
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An acoustic mine is a type of naval mine which monitors audio activity in its vicinity. Depending on its design, it will either passively listen to its environment, depending only on the noise that is made by passing ships or actively send out audio pulses, not unlike a sonar, listening to the lapse in time in which the echo returns to it.
The mine may freely drift, be moored at a certain location and depth, or lie at the bottom of the ocean floor.