The scale of the operation is phenomenal, and this ensures everyone's safety and welfare, along with the preservation of the cave, is looked after with expert precision. That's what we called this place when we first discovered it," caving expert Howard Limbert, elaborates. Tourism development poses a potential threat to the environment of the cave. We continue on, stepping deeper into the void that is considered by some to be the largest cave in the world. I smile at our guide's warning and enter the lush jungle growing inside Hang Son Doong, a 3-million-year-old cave in the central part of Vietnam. Unexploded ordnance is scattered throughout the fields and jungle, putting thousands of lives at risk every single day. The journey to Hang Son Doong is not for the faint-hearted. Will history repeat itself with the world's largest cave?
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