Dolphins' beaching closely followed sub's exercisesKEY WEST - The U.S. Navy is investigating whether sonar used in the training activities of a submarine off the Florida Keys this week may have contributed to the mass stranding of more than 80 deep-water dolphins, at least 19 of which have died.
Groups of rough-toothed dolphins mysteriously began beaching off Marathon on Wednesday afternoon -- within 24 hours, and perhaps less, of exercises conducted off Key West by the USS Philadelphia, a submarine based in Connecticut.
A Navy spokeswoman said Friday she did not know if the sub was still in the area the day of the stranding or if the vessel was using active sonar -- considered by some scientists to be potentially harmful to marine mammals -- during its mission.
''This is absolutely high priority. We are looking into this. We want to be good stewards of the environment and anytime there are strandings of marine mammals, we look into the operations and locations of any ships that might have been operating in that area,'' said Lt. Cdr. Jensin Sommer, spokeswoman for Naval Submarine Forces, based in Virginia.
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