From the Site:
Long ago, our ancestors were using caves as shelter from wild animals and the forces of nature. Perhaps, this base necessity however, has always been eclipsed by man’s curiosity and desire to explore the mystical and enigmatic air inside the abyss. In the past, Environmental Graffiti has explored some amazing uses of caves – from discotheques, temples and underground cities to hotels and primary schools. That’s only scratching at the surface however. Today, with all sorts of equipment, caving has turned into something of an extreme sport - it involves climbing, crawling and sometimes even swimming. Looking at the most extreme end then, what about those caves that create the enigma, that fuel the stuff of legends; caves that appear bottomless and that seem to extend to the very center of the earth? What are the ten deepest caves on our planet?
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