Xinhua write 4 workers rescued from tunnel construction collapse.
http://www.xinhuanet.com/english/2020-08/19/c_139302525.htm
Hi, how did the accident happen?
http://www.xinhuanet.com/english/2020-08/19/c_139302525.htm
Workers rescued after 47 hours in collapsed railway tunnel - Xinhua | English.news.cn
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