A massive sinkhole opened in the Chinese city of Dongguan on Thursday when a tunnel construction site collapsed.

In an eyewitness video posted to Weibo, the ground started falling away under some buildings, resulting in their edges dangling over the cavernApple Daily says a worker at the site died during the tragedy.

Dongguan is in the southern Chinese province of Guangdong. According to census figures from 2011, 8.2 million people live in Dongguan.

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Watch the ground fall away as massive sinkhole opens in China