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able to talk to communicate some like 24 to 28 kilometers underwater. Pretty amazing. Well, if a man was going to communicate using acoustic communication, it's produced when a physical object breaks rapidly. Generating compression waves. It's just a throwing particle to ripple or to intercomers, translate those varying pressure changes into sound. It's pretty amazing. It was a great topic. It's been an interesting topic to read up on when you're going to communicate.