CNN At This Hour With Berman and Michaela June 4, 2014 15:57:00
Low frequency vibration. theres a pulse going on, and this pulse, you couldnt hear with the human ear. you would feel it perhaps but you wouldnt be able to hear it with the human ear. theyd sped it up so you can interpret it by the human ear. so thats not really what it sounds like. remember, the lower frequencies in the ocean travel much, much further than higher frequencies. thats what youll here, that low frequency pulse. it wont give you much characteristics to tell you specifically what it ...
Source: archive.org