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Sansha Yongle Blue Hole
February 14 , 2026
18 hrs 0 min
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- Scientists released detailed findings on the Sansha Yongle Blue Hole in the South China Sea.
- The Sansha Yongle Blue Hole, also called Dragon Hole, has a confirmed depth of 301.19 metres.
- It was once the world’s deepest blue hole before a deeper site was confirmed in Mexico.
- A remotely operated vehicle created its first complete three-dimensional map in 2017.
- Rock ledges inside the hole show past sea level changes during colder climatic periods.
- Oxygen levels drop sharply below about 100 metres, and hydrogen sulphide is present in deeper layers.
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