A low rumble thrums through the deck as Tacoma, a 5,000-ton ferry, makes its run across Puget Sound from Seattle to Bainbridge Island. Standing near the railing, Colin McCann, a legislative analyst for Washington State Ferries, points to the water where the agency recently dropped a microphone 500 feet below the surface as part of a study to capture the acoustic profile of every vessel in the state’s fleet.
Click here for original story, Noise pollution hurts wildlife, but states have trouble turning down the volume
Source: Phys.org