Bertha Is Finally Breaking Through In Seattle
After a two-year delay for repairs, the giant tunnel-boring machine is on the verge of completing its mission far beneath the city's streets.
Bertha the tunneling machine
Bertha, The Giant Borer That Broke, May Be Sinking Seattle's Downtown
The machine, the biggest of its type, was digging a tunnel under the city when it went kaput. To get to and fix Bertha, workers are digging a 12-story pit, which some say is damaging nearby buildings.