Top 10 Most disturbing unexplained mysteries in the world (With Pictures)

4. The Bloop

The Bloop is the name given to an ultra-low frequency and exceedingly strong underwater sound detected several times by the U.S. National Oceanic and Atmospheric Administration (NOAA) in 1997.

The source was roughly triangulated to coordinates: 50°S 100°W, in the south Pacific Ocean west of the southern tip of South America. The sound’s audio profile contains a rapid variation in frequency, closely resembling that of a living creature, such as a whale, though several times louder than that of the loudest recorded species, the blue whale.

This leads many to speculate on the possibility that some creature larger than the largest known whale is lurking deep in the ocean depths.