Method for detecting submarines

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Possible Answers: SONAR.

Random information on the term “SONAR”:

An Acoustic Doppler Current Profiler (ADCP or ADP) is a hydroacoustic current meter similar to a sonar, attempting to measure water current velocities over a depth range using the Doppler effect of sound waves scattered back from particles within the water column. The term ADCP is used synonymously for all kind of acoustic current meters although the abbreviation originates from the name of an instrument series by Teledyne.[1] ADCPs have been commercially available since the late 1980s. The working frequencies range from 38 kHz to several megahertz.
Taken from Wikipedia