Natural Defense Resources Council press release: “The U.S. District Court for the Central District of California issued today a preliminary injunction requiring a series of mitigation measures that will govern the use of mid-frequency (MFA) sonar by the U.S. Navy during training exercises in the rich biological waters off Southern California. In its order, the Court considered both the environmental benefits of mitigation and the feasibility of specific measures…The high-intensity MFA sonar system can blast vast areas of the oceans with dangerous levels of underwater noise and has killed marine mammals in numerous incidents around the world. The waters off Southern California have some of the richest marine habitat in the country, and include five endangered species of whales, a globally important population of blue whales, the largest animal ever to live on earth, and as many as seven individual species of beaked whales, which are known to be particularly vulnerable to underwater sound.”