Sound may classified as good and bad. Good sound like music, songs, sea wave sound, wind blow sound, sound from wind blowing leaves, bird singing, etc. Bad sound, or harmful sound are those intolerable, noise, harmful to people. Bad or unwelcomed sound that harm persons all the times should be eliminated.

It seems that one of the best way to eliminate sound harm is to use water-insolation,  or let the harmful sound source be emerged in water.

Today we declare that we as human can remove or destroy harmful sound.