For 60 Years, an Eerie Quack Sounded Across the Seas. Scientists Just Found Its Source. - AOL

For 60 Years, an Eerie Quack Sounded Across the Seas. Scientists Just Found Its Source. AOL
Mysterious, Repetitive ‘Quacking’ Noise in the Southern Ocean May Have Been a Conversation Between Whales Smithsonian Magazine
This sound was recorded 40 years ago at the bottom of the sea: No one dares to go down Riazor.org
Who – or What – Was Speaking in the Ocean? The Strange Repeating Sounds of the South Fiji Basin SciTechDaily
Mysterious Conversation Coming Out Of The Southern Ocean Between Unidentified Animals Continues To Drive Researchers Crazy TheTravel

For 60 Years, an Eerie Quack Sounded Across the Seas. Scientists Just Found Its Source. – AOL