Since the use of the first combat submersible during the American Revolutionary War, the Turtle, which was nothing but a shell propelled by human force and intended to lay loads on the hulls of British ships anchored in the port, the detection of submarine warships has always been a major issue in naval combat. But it was not until the end of the First World War that the first sonars, developed by the French Paul Langevin as well as by the American Walter Guydon Cady, were actually able to detect the famous German Unterseeboot which caused great damage to the navies. French and British trade officials responsible for fueling the war effort of the two countries thanks to their colonial empires.
Since that date, technology has evolved considerably, with increasingly powerful and sensitive active and passive sonars, and increasingly powerful computers capable of analyzing the sound signal. But basically the technological basis remains the same, it's all about sound which travels much faster and farther in water than in air. And now, modern sonar used on board submarines or anti-submarine warfare frigates and destroyers are capable of detecting, isolating and identifying sound in the ocean no greater than that which a top-of-the-range dishwasher, several dozen, sometimes hundreds of kilometers away, depending on the conditions.
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