Beneath the surface of the Pacific Ocean it can get pretty noisy.
Hundreds of big ships, barges, fishing boats and other vessels motor up and down the Northwest coast every year.
Some new research details how that noise could make life harder for endangered marine mammals.
Picture yourself at a noisy bar. You realize that you have been shouting at the top of your lungs all night in order to be heard. Well, orcas in Puget Sound are in kind of the same situation.