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Blue Holes

"A blue hole is a cave (inland) or underwater sinkhole. They are also called vertical caves .....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." (Wiki - see http://en.wikipedia.org/wiki/Blue_hole )

Connected Sites

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A connection should:

  1. Not be "self evident"
  2. Link at least 3 different sites
  3. Not duplicate or merely subdivide the "Category" assignment already identified on this site.
  4. Add some knowledge or insight (whether significant or trivial!) about WHS for the users of this site
  5. Be explained, with reference to a source