Can’t call the Highway 99 tunnel “world-record” anymore
A future four-lane Highway 99 tunnel under downtown Seattle can no longer be crowned the widest single-bore tube on earth. Russia has signed a deal for a 63-foot tunnel boring machine, according to an announcement by German supplier Herrenknecht. The Seattle machine, by Hitachi-Zosen of Japan, is to be 58 feet across when it launches from Sodo in 2013. Both Read More ›