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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Jack Dykinga / Stalagmites and stalactites in underground cavern with tourquise waters of Cenote Papakal (sink hole), near Merida, Yucatan, Mexico October 2009
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Wild Wonders of Europe / Radisics / Ice forming stalagmite structures in Ledena Pecina (an ice cave) inside Obla Glava (Rounded head peak) Durmitor NP, Montenegro, October 2008
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Wild Wonders of Europe / Radisic / Ice forming stalagmite structures in Ledena Pecina (an ice cave) inside Obla Glava (Rounded head peak) Durmitor NP, Montenegro, October 2008
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Chien Lee / Sunlight filters through lowland rainforest into the entrance of a limestone cave, Gunung Mulu National Park, Malaysia
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Jack Dykinga / Stalagmites and stalactites in underground cavern with azure waters of Cenote Papakal (sink hole), near Merida, Yucatan, Mexico October 2009
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Martin Gabriel / King Otto cave, Velburg, Bavaria, Germany, dripstones with mark of ice-age water level
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Martin Gabriel / King Otto cave, Velburg, Bavaria, Germany, stalactite and stalagmite grown together
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Gerry Ellis / Interior of Kelly Hill caves, Kangaroo Island, South Australia
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Jim Brandenburg / Stalagmites and stalactites in Lehman Caves, Great Basin National Park, Nevada
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Jim Brandenburg / Stalagmites and stalactites in Lehman Caves, Great Basin National Park, Nevada
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Chien Lee / Limestone formations within Lang Cave, Gunung Mulu National Park, Malaysia
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Chien Lee / Limestone formations within Lang Cave, Gunung Mulu National Park, Malaysia
