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First undersea tunnel opens in northeast China
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Cutting travel time from one hour to just five minutes, this 5.1-kilometer undersea tunnel connects the south and north of Dalian Bay in northeastern China. The tunnel opened for traffic on May 1, 2023. The designated speed limit is 60 kilometers per hour. And the tunnel is built to last 100 years.

Dalian is a coastal city in northeastern China, among the country's first cities to open up their economies. But Dalian has for years suffered a sluggish economy. The tunnel, an extension of one of Dalian's main roads, is designed to help improve traffic and boost logistics with the aim of bolstering growth.

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