In 1997, the United States Navy recorded an enormously loud low-frequency underwater sound, originating 3,000 miles away in the abyssal depths of the southern Pacific Ocean. The sound was ultimately determined to be of animal origin, although of a species and gigantic size hitherto unknown to science. It has not been heard again... Until now.
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Used availability for Eric S Brown's Bloop
January 2013 : USA Paperback
December 2012 : USA, Canada, UK Kindle edition