What is the use of sound waves to detect and measure objects underwater

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Examples are the following: 1. 1996: rash of church thefts include one to finance trips to cape cod.-on this day in 1996, a lutheran treasurer in cheshire, connecticut was accused of  stealing from his church to finance a lifestyle that included resort trips and vacation homes on cape cod and in vermont.2. the story in the new york  times began: -lutheran treasurer in connecticut accused of stealing from churcha former treasurer of the lutheran churches governing body in new england was arrested yesterday on charges that he embezzled $800,000 from the church to finance a life style that included resort trips and vacation homes on cape cod and in vermont.