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Humans do not have directional hearing underwater because the brain determines the location of a source of sound by using the difference in time it takes the sound to reach the two ears. In air sound travels about 330 m/s where as the speed of sound in water is about 1483 m/s, which means the difference in time to reach each ear is much smaller and the brain is unable to determine which ear the sound got to first. (this is the basic answer but the difference in speed also changes how sound reflects off the curvature of the outer ear which further distorts our perception of location)

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