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Blue Hole: distant aerial
Blue Hole: map
Blue Hole: closer
Blue Hole: boats for scale
Blue Hole: scuba diving
Sink holes
Sink hole: Florida
Florida Winter Park sink hole
Early St. Louis, showing sink holes:
St. Louis sink hole: 1900
St. Louis: modern sink holes
Guatemala City “Sinkhole” – not actually a sinkhole
Blue Hole: former stalactites
Cenote:
Chichen Itza: map
Chichen Itza Cenote:
Chichen Itza Cenote:
Chichen Itza: aerial
Cenote Yax Mul, Mexico
Aricebo
Great Barrier Reef (Australia)
Great Barrier Reef (Australia)
Great barrier reef (Australia)
Zacaton (Mexico):
http://www.laputanlogic.com/articles/2004/02/17-0001.html
Zacaton (Mexico):
http://www.searchanddiscovery.com/documents/2008/08025franke/images/03.htm
Dean’s Blue Hole (Bahamas):
http://www.venturethere.com/blogs/detail/Freediving-Deans-Blue-Hole-Vid/186
Xiaozhai tiankeng
http://www.speleogenesis.info/archive/publication.php?Type=publication&PubID=3289
Xiaozhai tiankeng:
http://www.wondermondo.com/Countries/As/China/Chongqing/Xiaozhai.htm
Dashiwei tiankeng:
http://www.wondermondo.com/Countries/As/China/Guangxi/Dashiwei.htm
Dashiwei tiankeng:
http://punjapit.wordpress.com/2011/02/08/chinathe-dashiwei-tiankeng/