Sperm Whales Dive 3km Into Darkness. What They Find There Surprises Everyone.
In 1997, researchers monitoring hydrophones in the deep Pacific Ocean recorded a sound they could not identify. It was extraordinarily loud, far louder than any biological source they had documented, and it originated from somewhere in the deep ocean off the coast of South America. They named it the Bloop. For years it circulated as one of the ocean’s great mysteries, attributed variously to…















