In an age where every square mile of Earth's surface is so easily photographed and surveilled, to be a true explorer—to see what no human has ever seen before—one has to descend into the bowels of the Earth. Armed with high-tech lasers scanners, cavers are slowly mapping that underground world. And now they've found the world's largest cave chamber, equivalent in size to four Great Pyramids carved out underground.
from Gizmodo http://ift.tt/1oriyTS
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