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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Chadden Hunter / Cameraman Gavin Thurston filming ice crystals under volcanic ice cave, Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009
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Chadden Hunter / Filming around the extremely delicate ice formations in volcanic ice cave, Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009
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Pete Oxford / Cenote, a freshwater-filled limestone sinkhole, with stalagtites and stalagmites. Quintana Roo, Yucatan Peninsula, Mexico.
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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 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
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Robert Smith / Diver exploring 'Don's One Hundred Dollar ' within Sistema Dos Ojosa- a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring 'Sistema Carwash' a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring 'Sistema Carwash' a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, 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
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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 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring 'Sistema Carwash' a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring 'Sistema Carwash' a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof, swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and swollen Oparara River, near Karamea, Kahurangi National Park, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Juergen Freund / Jovi Villareal inside a massive illuminated cave in Caramoan, Caramines Sur, Luzon, Philippines 2008
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Kerstin Hinze / Lesser Horseshoe Bat (Rhinolophus hipposideros), hibernating amongst stalagtites in the cave Grotta Monte Majore, Sardinia, Italy
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Kerstin Hinze / Lesser Horseshoe Bat ( Rhinolophus hipposideros), hibernating amongst stalagtites in the cave Grotta Monte Majore, Sardinia, Italy
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Kerstin Hinze / Lesser Horseshoe Bat (Rhinolophus hipposideros) hibernating amongst stalagtites in the cave Grotta Monte Majore, Sardinia, Italy
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Inaki Relanzon / Potholer walking on mounds of salt crystals in cave, Cave Lachambre, Ria, Conflent, Pyrenees, France
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Pete Oxford / Limestone formations, stalagmites and stalagtites in caves, Southern Ankarana, Madagascar
