Fish? Could be this real? The Hum sounds-exactly like couple of diesel trucks. https://www.huffingtonpost.com/2012/09/07/seattle-hum-fish-midshipman_n_1865742.

Fish? Could be this real? The Hum sounds-exactly like couple of diesel trucks. https://www.huffingtonpost.com/2012/09/07/seattle-hum-fish-midshipman_n_1865742.html https://www.huffingtonpost.com/2012/09/07/seattle-hum-fish-m...