In 1997, underwater sensors detected an extremely powerful sound across thousands of miles of the South Pacific. Its rising ...
Add Yahoo as a preferred source to see more of our stories on Google. In 1997, NOAA scientists recorded a haunting, strange sound in the southern Pacific Ocean's depths. Theories about the sound's ...
In 1997, NOAA researchers recorded a mysterious ultra-low-frequency noise so powerful it registered on sensors thousands of miles apart.
Scientists recorded a mysterious sound that crossed the Pacific Ocean. Here’s what this ocean signal really was and how it was finally fully explained.