Dragon's hole

The Dragon Hole is a blue hole, a sea sinkhole, located in the waters of the Paracel Islands in the South China Sea.

Descriptionchange code Named Longdong or "Hole of the Dragon" by the Chinese, it is in the form of a huge limestone cavity 300,89 meters deep and more than 100 meters in diameter. Its depth remains to be confirmed by other research. Trainingedit code

According to current theories, these chasms appeared during the previous period of glaciation, when the sea level was a hundred meters lower than the current benchmark. More precisely, they are vast underground cavities and limestone excavated in the rocks by the infiltration of acid rain into the ground. Over time, they have grown until their ceiling collapses leaving exposed these remarkable chasms then covered by the sea during the rising waters. Studycodify the code

To learn more about the blue hole, Chinese researchers conducted a large field study between August 2015 and June 2016. For months they used several underwater instruments and cameras to try to estimate dimensions of the chasm and to discover the secrets. Notes and edit the code

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