Sonar is known to be harmful to dolphins and whales killing and causing them to strand. For every one dolphin that strands another 10 have sank at sea. The Navy is tripling the amount of sonar they will be broadcasting. This means 30 million marine mammals will be impacted!! Naval sonar tests will be conducted in all the oceans with the exception of the Arctic and Antarctic. Follow the link to comment. Please speak up for dolphins and whales they need your voice! Link to Navy