Inside Son Doong: The Vietnam cave bigger than a Boeing 747 that took 17 years to find again

Deep in the jungles of central Vietnam, hidden behind dense forest and roaring underground rivers, lies a cave so enormous that a Boeing 747 could fly through its largest chamber without touching a wall. Son Doong, officially the world's largest known cave passage, stretches 5.6 miles in length and rises as high as 65 stories in places.

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