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These breathtaking images capture the hidden depths of the world's biggest cave passage - so large the end is yet to be found. Hidden in the depths of the Vietnamese jungle lies The Hang Son Doong, part of a network of over 150 caves. Surrounded by jungle and used in the Vietnam war as a hideout from American bombardments, the cave passage is so large that it could hold a block of 40-storey skyscrapers. Its entrance was only rediscovered by British cavers in 2009. The cave passage in Phong Nha-Ke Bang National Park was originally thought to be a modest 150 metres long and 200 feet high. But these images - taken during two further expeditions of the caves - show the previously undiscovered depths of the cave passage, now the largest in the world. At a mammoth 2.5 miles long, 330ft wide and almost 800ft high, Hang Son Doong - also known as Mountain River Cave - is as high as 25 double decker buses. The cave, lit from above through a skylight, is one of a network of some 150 connected caverns, many still not surveyed, in the Annamite mountains. And as shown in these amazing images taken by photographer Carsten Peter, there is even a jungle concealed deep inside the cave. Mr Carsten, from Munich, Germany took the images in 2010 when he joined British and German cavers during further expeditions of the site.
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