Comments by "Controller🎮Player1" (@controllerplayer1720) on "An Entire Mountain in Sichuan Collapsed, China’s Underground Is Hollowed, Risking Sudden Sinkholes" video.

  1. i saw a video showing that there's a lot of maoqidong or sinkholes in sichuan province.. it might be cause of underground weapon test back in 1960's - 1970's..
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