Vietnam’s ‘Nightmare’ sinkhole remains largely unexplored
21/03/2025
Vietnam’s ‘Nightmare’ sinkhole, 250 meters deep, remains largely unexplored, with fewer than 10 people ever reaching the bottom.
Vietnam’s ‘Nightmare’ sinkhole, 250 meters deep, remains largely unexplored, with fewer than 10 people ever reaching the bottom.
Journalist Michael Wing of The Epoch Times of the United States has dubbed Hung Thoong (Thoong Valley) in the central province of Quang Binh as
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