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Vietnamese jungle lies The Hang Son Doong, part of a network of over 150 caves.
Discovered by British cavers in 2009, the cave passage in Phong Nha-Ke Bang National Park was originally be a modest of 150 meters long and 200 feet high.
Intrepid journey: A caver stands in front of a huge rock formation as the light shines beneath a skylight in Hang Son Doong
These remarkable, amazing images - taken in 2010 by photographer Carsten Peter from Munich, Germany when he joined British and German cavers team.
Wonderful waterfalls: A waterfall explodes into Hang Son Doong in the hidden depths of the Vietnamese jungle, which is part of a network of over 150 caves
The purpose was to make a complete exploration of Hang Son Doong and create a photographic record of the cave.
Cartsen, 52 said: ‘We discovered the cave, which is new and having huge area; so to find and access them is very difficult.
‘Photographing caves of this size is a challenge, it needs a lot of preparation.
Going underground: Expedition members enter the cave, tunnelled out by the Rao Thuong River in Vietnam - the cave was discovered in 2009
Gigantic proportions: 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
Cartsen added: ‘it's a great feeling to photograph a newly discovered cave.'
‘I love to explore, I have been in some great caves in my lifetime and this is one of the most magnificent.
‘I've been a photographer and explorer for the last 35 years and I've visited so many caves, I've lost count.
‘But this is by far one of the most unique and unusual caves I have ever seen.
‘To see a cave so large it has a forest inside is superb - it was overwhelming.’
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