Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008. Model released
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Robert Royse / Smith's Longspur (Calcarius pictus) male singing, Alaska
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Robert Royse / Smith's Longspur (Calcarius pictus) male, Alaska
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Robert Royse / Smith's Longspur (Calcarius pictus) male, Manitoba, Canada
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Robert Smith / Freshwater Limestone sinkhole / Cenote called 'Sistema Mayan Blue' with Stalagtite formations, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'Three stars' Tulum, Quintana Roo, Mexico, September 2008 Three Stars
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Robert Smith / Diver exploring bones at a freshwater Limestone sinkhole / Cenote called ' The Pit' Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'Sistema Xunaan Ha' Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'Sistema Xunaan Ha' Tulum, Quintana Roo, Mexico, September 2008
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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 a freshwater Limestone sinkhole / Cenote a traverse to 'The White River' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
