and the tunnels are bored into the rock. The outcome depends on the overburden, or what is above the tunnels. If it's limestone or sandstones, a disaster could ensue as they start to crumble ...

Chris Gregoire, King County Executive Ron Sims, and Seattle Mayor Greg Nickels announced their recommendation to replace the Alaskan Way Viaduct with a deep-bored tunnel. The law makers plans ...

This was the first time that Central Japan Railway Co. (JR Tokai), which is building the maglev line, allowed reporters to visit a tunnel being bored at this depth. In Kawasaki’s Asao Ward ...