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Vietnam caves: inside the giant jungle cavern of the Hang Son Doong

Expedition members enter Hang En, a cave tunneled out by the Rao Thuong River

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.

Picture: CARSTEN PETER/NATIONAL GEOGRAPHIC STOCK/CATERS NEWS