The familiar sounds of the sea are captured in the incredible soundtracks of natural history documentaries as well as inside seashells when they are held up to our ears. The sound transports us to the blue planet that covers over 70 percent of the Earth’s surface.
In the summer of 1997, a number of hydrophones in the Equatorial Pacific Ocean picked up a bizarre new sound phenomenon. The underwater microphones picked up a signal that rose rapidly in frequency for about a minute before disappearing. The sound was picked up repeatedly by US government microphones for the duration of that summer but has not been heard since. It became known as ‘The Bloop’ and was detected by sensors over a range of 5,000 kilometers.
Initial tracking suggested that the sound profile of ‘The Bloop’ was comparable to that of a living animal. However it was far louder than any whale song ever recorded.
The mystery remains just a drop in the ocean of the hundreds of mysterious sounds that make our planet a sonic wonder.
This post was originally published by BBCEarth.
Photo from shareski via flickr
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