Sitting at the dock of the bay you might hear the crash of breaking waves and squawking seagulls flying overhead. As you take in all the sites and sounds, you next hear a speeding boat racing by and an oil tanker a mile away. Grinding engine noises and long, low, horn sounds can be deafening in any harbor. And while you can handle it for the hour or two you spend there, the continuous sounds of these noisy vessels are being found to have repercussions on marine life.