Hydroacoustics
Hydroacoustics is a section of acoustics that studies the radiation, reception and propagation of sound waves in a real aquatic environment for the purpose of underwater location, communication, etc. The main feature of underwater sounds is their low attenuation, so that under water sounds can propagate much longer distances than , for example, in the air. In addition to the attenuation due to the properties of the water itself, the range of sound propagation under water is affected by sound refraction, its scattering and absorption by various inhomogeneities of the medium.