Its killing amazing marine life particularly whales and dolphins. Its bad enough with the oil spills and the nuclear plants radiation effects and then this. You've got to be kidding me. Then I hear that this sonar technology is necessary. Oh please like the strongest military superpower is worried about submarine attacks!!!! Check out this video https://www.youtube.com/watch?NR=1&v=7Ioklkxbzck&feature=endscreen