if sonar is designed to listen then thats what it does sound travels faster than light in water due to the closeness of molocules hence why the speed to sound equasion does not work in water or space.
if you get a glass and put it in the water and put your ear to it you can hear a ship miles away, and the guy who said that lived almost 150 years ago so if he can hear a ship with a glass im dam sure a sonar can hear a ship a hundred miles away
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