tunneling machine

Effort To Repair Seattle Tunnel Machine Delayed An effort to repair the giant tunneling machine stuck under downtown Seattle is going more slowly than expected.
Fixing Seattle Tunneling Machine Will Take MonthsWash. DOT says many of Big Bertha's cutter-head openings are clogged with dirt and debris.
3-Foot Chunk Stuck In Tunneling Machine 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.
City Tunneling Project BeginsThe world's largest tunneling machine is sinking its teeth into the soil under downtown Seattle.