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Sacred Blue Holes
Topic Started: Dec 13 2013, 08:31 PM (123 Views)
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Champion freedivers’ amazing Yucatan odyssey
Probing mystical cenotes using single breaths, Eusebio and Christina Saenz de Santamaria capture stunning images of otherworldly landscape
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Luna~Rose
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http://en.wikipedia.org/wiki/Blue_hole
A blue hole is a cave (inland) or underwater sinkhole. They are also called vertical caves. There are many different blue holes located around the world, typically in low-lying coastal regions. The best known examples can be found in Belize, the Bahamas, Guam, Australia (in the Great Barrier Reef), and Egypt (in the Red Sea).

Blue holes are roughly circular, steep-walled depressions, and so named for the dramatic contrast between the dark blue, deep waters of their depths and the lighter blue of the shallows around them.
http://en.wikipedia.org/wiki/Great_Blue_Hole
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