Open to traffic.
Construction on the 6.68-kilometer tunnel began in 2015 and cost 5.7 billion yuan ($790 million).
https://www.chinadaily.com.cn/a/202209/29/WS6334f2d1a310fd2b29e7a5a8.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.chinadaily.com.cn/a/202209/29/WS6334f2d1a310fd2b29e7a5a8.html
Sea tunnel cuts travel time in Shantou
www.chinadaily.com.cnAn underwater tunnel connecting the north side to the south side of Shantou Harbor in Shantou, opened to traffic Wednesday, significantly cutting travel times in the Guangdong province city.