A man stumbled on Vietnam’s Son Doong, the world’s largest cave passage. It took him years to find it again.
Vietnam’s Son Doong is large enough to match a skyscraper, however regardless of its immense dimension, it took 18 years for Ho Khanh, the man who first discovered the entrance, to rediscover Hang Son Doong, deep inside a Vietnamese jungle. In 2009, Peter MacNab, together with a five-man crew, had been the first to discover…
