Ashore, the sound waves coming from a noise source are totally reflected at the head due to the large difference in density between the head and the air.
The situation is similar at the interface between water and air: for example, the thunder of a thunderstorm cannot be heard underwater because the sound waves
are reflected on the surface of the water. Above water, the sound waves are therefore only absorbed via the eardrum.
From the time difference of the signal between the two ears, the brain calculates the direction of the sound source.
Under water, there is no reflection on the head, since the density of the head is about the same as the density of water.
The sound is thus also received via the skull bone and thus at both inner ears at the same time, which means that directional hearing is no longer possible.
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