Answer-What apparatus is used to locate a submerged object?

Sonar originally an acronym for Sound Navigation And Ranging is a technique that uses sound propagation usually underwater, as in submarine navigation to navigate,communicatewithordetectobjectson or under the surface of the water, such as other vessels.Twotypesoftechnologysharethename sonarpassivesonarisessentiallylisteningfor the sound made by vessels active sonar is emitting pulses of sounds and listening for echoes.