WSDOT’s record-breaking tunnel boring machine takes shape
Workers stand in the shadow of what will become the world’s largest-diameter tunnel boring machine. Currently being assembled in Japan, the machine will dig the SR 99 tunnel beneath downtown Seattle starting in summer 2013. Scheduled to open to traffic in late 2015, the tunnel will replace the central waterfront section of the Alaskan Way Viaduct.
Popular Mechanics has a great article this week about digging the world’s widest tunnel right here on our front porch. Check it out — Digging an Enormous Tunnel Under Downtown Seattle.
And you don’t want to miss WSDOT’s awesome flickr feed — especially SR 99 Alaskan Way Viaduct – Preparing for tunnel construction set. Lots of great photos to marvel at!
WSDOT’s record-breaking tunnel boring machine takes shape
If you’re still hankering for more tunnel action, take a look at Popular Mechanic’s photos gallery about The World’s 18 Strangest Tunnels.