Whales face numerous threats, many from garbage and toxins dumped into the oceans. Human-caused noise pollution also harms whales, leading to death, stranding, temporary and permanent hearing loss and hemorrhaging around the brain, ears and other tissues from decompression sickness when whales are startled by sound and surface too quickly.
Sonar used in naval training is a major cause of these debilitating and often deadly injuries to whales and other aquatic animals. With their sensitive hearing, marine mammals are particularly vulnerable. Sonar disrupts their ability to communicate, migrate, breathe, nurse, breed, feed, find shelter and, ultimately, survive.