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Project Mogul was conceived by Dr. Maurice Ewing who had earlier researched the deep sound channel in the oceans and theorized that a similar sound channel existed in the upper atmosphere: a certain height where the air pressure and temperature result in minimal speed of sound, so that sound waves would propagate and stay in that channel due to refraction.
Sofar bomb (SOund Fixing And Ranging bomb), a long-range position-fixing system that uses explosive sounds in the deep sound channel of the ocean