The suspicion of a causal relationship between whale strandings and either seismic tests or the use of new high-tech sonar tracking devices in military-training exercises had been mounting for some time. Similar coincidences had been noted off the coasts of Brazil, the Bahamas, the Galápagos Islands, the U.S. Virgin Islands and Japan, as well as in the waters off Italy and Greece. Necropsies performed on a number of the whales revealed lesions about their brains and ears. The results of the examinations performed on the Canary Islands whales, however, added a whole other, darker dimension to the whale-stranding mystery. In addition to bleeding around the whales’ brains and ears, scientists found lesions in their livers, lungs and kidneys, as well as nitrogen bubbles in their organs and tissue, all classic symptoms of a sickness that scientists had naturally assumed whales would be immune to: the bends.
It might sound like something out of a bad sci-fi film: whales sent into suicidal dashes toward the ocean’s surface to escape the madness-inducing echo chamber that we humans have made of their sound-sensitive habitat. But since the Canary Islands stranding in 2002, similar necropsy results have turned up with a number of beached whales, and the deleterious effects of sonar and other human-generated sounds on ocean ecosystems have been firmly established.
