Bertha Launch Pit

Transforming the SR 99 tunnel launch pit

Digging In: Seattle's Big Bertha

Bertha Pushes Into the Access Pit

Filling in the access pit used to repair the SR 99 tunneling machine

Preparing to launch the SR 99 tunneling machine beneath Seattle

launch pit and tbm assembly

Grandy Candlestick

SR 99 Bertha Public Launch

Building a tunnel inside Bertha’s disassembly pit

Removing Bertha's starting blocks

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

The part of the SR 99 tunnel built without Bertha

Inside Bertha Tunnel Boring Machine Control Room

Bertha

Inside the SR 99 tunnel: A short look at Bertha’s disassembly

Big Bertha

Stephanie Chacharon

Bertha- Raising tunnel boring machine Bertha from below

SR 99 tunnel launch pit and tbm assembly time lapse

Grandy Candlestick

Building underground walls for Bertha's access pit

A drone’s view of Bertha’s breakthrough

Bertha’s last moves