Explained: "UFO" rises from ocean in El Salvador (Rock)

Trailspotter

Senior Member.
The most likely, this is sea wave diffraction on an underwater rock near the shore combined with interference and other wave phenomena.
Historic images from Google Earth Time Machine confirm the presence of underwater reef and show similar wave patterns. The OP image is from 7/2013. Here are two earlier images of the same area (13.1596808,-87.7130062):

09/20069:2006.jpg

11/201211:2012.jpg

And here is a similar image from Bing maps (date unknown):
Screen Shot 2017-01-21 at 09.25.58.png
 
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Whitebeard

Senior Member.
Most certainly a large rock, and one dangerous to shipping.

here's a nautical chart of the area, the southern tip of the Isla Meanguera, off the Pacific coast of El Salvador, I've ringed the reef on the chart
NauticalChart.jpg
 
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