Does Navy sonar testing harm dolphins?

Navy testing from next generation sonic devices has been know to cause damage to the brains of cetaceans miles away from test areas. Even at 100 miles away whales and dolphins would hear the sound at 140 decibels, like standing next to an f-15 fighter jet taking off. Whole dolphin and whale pods are frequently found washed up on the shore near navy sonar test sites around the world.