World’s deepest underwater sinkhole discovered in South China Sea

Published on : Monday, August 1, 2016

SinkholeChinese scientists have discovered the world’s deepest underwater sinkhole — going down 300 meters below sea level — has been discovered in the highly disputed waters of the South China Sea.


Called the “Dragon Hole” by locals, it’s 987 feet (300 meters) deep, according to researchers who have spent the past year exploring the site.


The hole is located in one of the more geopolitically unstable areas in the world, with surrounding countries such as Vietnam, the Philippines, Indonesia, and, of course, China duking it out for control.


An underwater robot from the Sansha Ship Course Research Institute for Coral Protection was used with a depth sensor to determine the size of the sinkhole.


Dean’s Blue Hole in the Bahamas was previously thought to be the world’s deepest underwater sinkhole, at a depth of more than 660 feet.


The hole is located in a coral reef off the Paracel Islands. It is described as the “eye” of the South China Sea, by the locals.


Measures have been drafted to protect and study the blue hole in the South China Sea by the Sansha city government in Hainan Province.


More than 20 species of fish was found in the upper part of the sinkhole, which is also known as a blue hole. But below 100 meters, it is largely oxygen-free, meaning life is unlikely to survive there.


The picture has been taken from



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