Robert Smith / Diver exploring at the surface of a freshwater Limestone sinkhole / Cenote called 'Sistema Xunaan Ha' Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring the Sistema Sac Actun, an underwater cave system situated along the Caribbean coast of the Yucatan Peninsula, Tulum, Quintana Roo, Mexico, September 2008
