Natural Resources Defense Council: “The oceans are not a silent world, but dynamic, living symphonies of sound. In water, sound travels five times faster, and many times farther than it does in air. Whales, dolphins, porpoises, and other marine mammals have evolved to take advantage of this perfect sonic medium. Just as we rely on sight to survive, they depend on sound to hunt for food, find mates, and detect predators. Over the last fifty years, our increasing ocean presence has drastically transformed the acoustic environment of these majestic creatures. Undersea noise pollution is invisible but it is damaging the web of ocean life.”

• Report – Sonic Sea – Impacts of Noise on Marine Mammals