In 1997, the National Oceanic and Atmospheric Administration recorded from deep in the ocean one of the loudest sounds ever detected. The mysterious ‘Bloop’ was heard at listening stations underwater over 5,000 km apart and no known animal could make it and no man-made source was ever found.
But after an in-depth research NOAA and Oregon State University seismologist Robert Dziak suggested that the frequency and time-duration characteristics of the ‘Bloop’ signal are consistent and essentially identical, to icequake signals.
Despite Dziak’s explanation that the possible source of the ‘Bloop’ was an icequake, many people are not convinced and believe that the mysterious deep ocean signal was more likely coming from something from another world.
The sound starts at 5:03 for those who want to skip the first 5 minutes.