Washington State Department of Transportation » Get a drone’s-eye view — two miles in two minutes — under downtown Seattle to see the progress on the city’s double-decker underground highway.
ENR Northwest » The launch and exit pits created for tunnel-boring machine Bertha in Seattle are in the last phase of being transformed into parts of the multilevel roadway that replaces the Alaskan Way Viaduct. Here’s how the process works.
King 5 » Seattle Tunnel Partners (STP) knew an 8-inch steel pipe was in Bertha’s path two years before the tunnel boring machine chewed through it, according to a new suit filed by Washington state. STP says the pipe stranded the massive machine for two years while extensive repairs were made.
WSDOT » On April 4, 2017, one of the world’s largest tunneling machines chewed through more than 1,000 tons of concrete and fiberglass to end a 1.7 mile journey underneath downtown Seattle. With a drone’s eye view, this video shows the raw power of Bertha’s breakthrough – start to finish.
KIRO7 » Tunnel-borer Bertha may complete drilling the State Route 99 tunnel in Seattle this week after four years of work, state officials reported. The tunnel should be in use by 2019, replacing the Alaskan Way Viaduct.
The Seattle Times » A 360-degree video shot inside the tunnel being built beneath Seattle gives viewers a unique new perspective of what it’s like to bore a 2-mile tube and construct a highway 200 feet underground.