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Geotechnical Egineering News tagged with [laser-guided machines]

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The fascinating world of boring tunnels
THE IRISH TIMES   01 September 2016  
A giant drill at the construction site for the Gotthard Base Tunnel near Sedrun, Switzerland. Photograph: Johannes Simon/Getty Images
<p>That's Maths: Laser-guided machines are today used to drill tunnels from both ends, but how did the ancient Greeks do it?</p>