00:00Imagine digging a highway tunnel deeper than a skyscraper underwater.
00:04China just finished the main part of the world's longest undersea highway tunnel.
00:09This giant tunnel plunges 115 meters deep, like a 38-story building under the sea.
00:15Huge shield machines dug through mud and rock, showing amazing new ways to build.
00:20It creates super-fast connections, linking cities across the water like never before.
00:25To understand this impossible feat even better, check the link in bio.
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