The boring machine has excavated just more than 1,000 feet of the nearly two-mile tunnel. Tunneling stopped Dec. 6 when the machine overheated and it has barely moved since.

Bertha first began boring her way under Seattle in 2013. Late that year, the machine hit a snag after running into a pipe, as well as loose soil. Repairs on the machine lasted until 2015.

Bertha is done digging. After four years of moving — and sitting broken for a while — underneath downtown Seattle, the world’s largest tunnel-boring machine on Tuesday reached the end with ...

In 2013, construction crews were tasked with replacing a failing elevated highway along Seattle’s waterfront. The solution was a nearly two-mile-long, double-decker tunnel running right under the city ...

Seattle Tunnel Partners spent the summer cutting the tunnel boring machine and her 5-story-tall cutterhead into pieces, lifting them out of the receiving pit and trucking them away.

After a two-year delay for repairs, the giant tunnel-boring machine has completed its mission far beneath the city's streets. Bertha Finally Breaks Through In Seattle Updated at 4 p.m. ET It was ...

[1/2]A worker monitors cable pulley wheels as the machine head from Bertha, the world's largest tunnel-boring machine, is lifted from an access pit for repairs in Seattle, Washington March 30, 2015.

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.

SEATTLE (AP) – Experts say they’ve at least partially solved the mystery of what’s been blocking a massive tunnel-boring machine beneath downtown Seattle for the past month: a steel pipe ...

Seattle Tunnel Partners is deciding how to fix broken seals on the world’s largest tunneling machine, called “Bertha,” which is stuck about 60 feet underground. It’s been mostly idle for ...

The world's largest tunnel-boring machine, stuck for over a year deep underneath downtown Seattle, was within feet of rescue on Friday, a state official said, raising hopes that a stalled $3.1 ...

Bertha's dirt-eating days are over — for at least six more months. Bertha's dirt-eating days are over — for at least six more months. The world’s largest tunneling machine, stuck underground ...