Bow waves of ships cause drag that is until you have a secondary wave displaced at a half wave length. The article cited does not have this information. I found this by watching the big, bigger and biggest episode on some cruise ship in the Caribbean.
Volume of what NOISE? Deafened by the roar of the greasepaint the smell of the the cloud. The spray on the bow wow wow of the sub woofers sub mariner arising from the pig pen to greet the world above from the world below the water swimming with the dolphins. Nonsensical words from the nut spinning round the bolt? This philosophy in a nutcase is where we belong.