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World's longest immersed tunnel lets visitors drive under the Baltic Sea
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Gotthard Tunnel: Worlds Longest and Deepest Tunnel Officially Opens
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Going 270 feet underground: An update on the DigIndy Tunnel System
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Inside Tesla’s New Cyber Tunnel
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Dubai’s deep tunnel drainage project reaches final pre-operational stage | …
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First undersea tunnel opens in northeast China
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World's longest expressway tunnel drilled through China's Xinjiang
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