Mystery solved? 8" steel pipe in the way of Seattle tunnel machine

«Previous
2 of 4 Photos
Next »
Read the story
Bertha Digs Away
«
  • Bertha Digs Away
  • Bertha Digs Away
  • Bertha Digs Away
  • 130730_bertha_big
»
Bertha Digs Away
Tunneling crews discuss their progress as they operate Bertha, the world’s largest tunneling machine, in November 2013. (Photo courtesy: WSDOT)