Bertha- Raising Tunnel Boring Machine Bertha From Below

Bertha- Raising tunnel boring machine Bertha from below

Big Bertha -- world's largest tunnel boring machine -- facing big Seattle challenge

CBS Evening News

World's most expensive breakdown? Bertha got stuck for a year under Seattle after digging 1,000ft

Raw video of Bertha in operation (Jan. 6, 2016)

Inside the TBM Bertha hyperbaric chamber

TunnelTalk Extra

Mystery object blocks world's largest tunnel boring machine in Seattle

Seattle's Big Bertha tunnel drill blocked by mystery object

Bye-Bye to Bertha, the world’s largest tunneling machine

Mystery object blocks world's largest tunnel boring machine in Seattle

Bertha: a timeline of the tunnel boring machine's progress

TBM Bertha cutterhead and drive unit lift

Hyperbaric work on TBM Bertha

TunnelTalk Extra

TBM Bertha repair update

TunnelTalk Extra

Bertha grinds into daylight

The Seattle Times

The ULTIMATE look at Bertha’s breakthrough

Jumbo transports largest tunnel boring machine 'Bertha'

Seattle's tunnel boring machine finishes digging a hole under the city

WSDOT #BerthaBreakthrough SR 99 Tunneling Machine Surfaces

OxBlue Corporation

Digging down to repair the SR 99 tunneling machine

This machine is digging a big hole through Seattle!