On August 31, 2009 an appeals judge lifted an existing ban on Navy sonar, and ruled against a lawsuit that would have prevented the U.S. Navy from resuming sonar training exercises off Southern California. The training exercises thus commenced on September 11, 2009 off San Diego. Within two weeks at least three great blue whales were reported floating dead off the Southern California coast. On October 12, another great blue whale was found dead off Big Sur. On Monday, October 19 yet another blue whale washed ashore, this time at Fort Bragg in Northern California. The latest incident has raised serious questions of whether or not the sonar used by the survey vessel confirmed to have hit the whale might have been responsible.
Full report: Blue Whale Deaths Off the California Coast by David Gurney
Navy's New Sonar System Suspected in Blue Whale Deaths