China is building the world’s longest underwater tunnel beneath the Bohai Sea--at 76 miles long it will pass through two deadly earthquake fault zones, will be longer than the current first and second-ranked underwater tunnels combined and will cost $42 billion.
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More information on the Bohai Sea Tunnel:
https://www.wikiwand.com/en/Bohai_Str...
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Video created by Bryce Plank