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Hang Son Doong: The world's biggest cave, so 'outrageous in size' it fits 2 jungles and the 'Great Wall of Vietnam'
Hang Son Doong cave — the name means "Mountain River ... born from the compressed shells and skeletons of ancient sea animals ...
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Lighting the darkness in one of the world's largest caves
Animals were quick to colonise ... Discovered in 1992, Hang Va cave (pictured) is hydrologically connected to Hang son Doong and although much smaller, it hides a remarkable world.