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Dragon Hole

Feb. 10, 2026

The Sansha Yongle Blue Hole, also known as the Dragon Hole, sits in the South China Sea and has drawn scientific attention for more than a decade.

About Dragon Hole:

  • The Dragon Hole is the popular name for the Sansha Yongle Blue Hole, a massive marine sinkhole in the South China Sea. 
    • Blue holes are steep-sided underwater cavities, often formed in limestone landscapes, that later flooded as sea levels rose.

     

  • Water in the lower part of a deep blue hole like Dragon Hole is stagnant and anoxic.
  • It is the deepest known underwater sinkhole in the world. 
  • However, many ocean species thrive in the upper section of the hole, where there is a unique ecosystem characterized by ample oxygen and nutrients.
Source : The Dragon Hole of the South China Sea, where the ocean slowly runs out of oxygen

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