What created this strange sound in Earth's Pacific Ocean?
Pictured above is a visual representation of a
loud and unusual sound, dubbed a Bloop, captured by
deep sea microphones in 1997. In the
above graph, time is shown on the horizontal axis, deep
pitch is shown on the vertical axis, and brightness designates loudness. Although
Bloops are some of the
loudest sounds of any type ever recorded in
Earth's oceans, their origin remains unknown.
The Bloop sound was placed as occurring several times off the southern coast of
South America and was
audible 5,000 kilometers away. Although
the sound has similarities to those vocalized by living organisms, not even a
blue whale is large enough to croon this loud.
The sounds point to the intriguing hypothesis that even larger life forms lurk in the unexplored darkness of Earth's
deep oceans. A less imagination-inspiring possibility, however, is that the sounds resulted from some sort of
iceberg calving. No further
Bloops have been heard since 1997, although
other loud and
unexplained sounds have been recorded.
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