An effort to repair the giant tunneling machine stuck under downtown Seattle is going more slowly than expected.
Wash. DOT says many of Big Bertha’s cutter-head openings are clogged with dirt and debris.
Crews have found a hard object more than 3 feet wide lodged in the tunneling machine that’s currently stalled 60 feet under the city of Seattle, officials said Wednesday.
The world’s largest tunneling machine is sinking its teeth into the soil under downtown Seattle.