Inside the Massive Factory Making 4,000 Concrete Tunnel Segments
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YouTubeFactory Secrets: How It's Made
Inside the Massive Factory Making 4,000 Concrete Tunnel Segments
Deep beneath our cities, massive subway tunnels are held up by thousands of precision-engineered concrete segments. But what happens if just one of them is off by a single millimeter? Today, we go inside a massive factory to see how tunnel lining segments are made—from $400,000 steel molds to the secret rubber gaskets designed to outlive us ...
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