How subway tunnels are made —@techinsider http://pic.twitter.com/Xliora5w6E— Vala Afshar (@ValaAfshar) May 19, 2017
via Twitter https://twitter.com/ValaAfshar
May 19, 2017 at 11:06AM
How subway tunnels are made —@techinsider http://pic.twitter.com/Xliora5w6E— Vala Afshar (@ValaAfshar) May 19, 2017
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