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Geotechnical Egineering News tagged with [underground tunnel]

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The Top 9 Longest Tunnels in the World
Interesting Engineering   08 May 2019   World  
Source: Svein-Magne Tunli/Wikimedia Commons
<p>Tunnels are some of the greatest engineering feats humanity has ever undertaken. We (humankind) have, in fact, been digging them for millennia.<br />But, they have not all been excavated for purely logistical reasons. Tunnels were, and still are, widely ...