Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jun 16, 2014
This animation illustrates Seattle Tunnel Partners' work plan for repairing Bertha, the SR 99 tunneling machine. The plan includes four major repair and enhancement elements: • Replacing the damaged seal system with a more robust system • Replacing the main bearing • Installing enhanced monitoring systems • Adding steel to strengthen the machine and accommodate the new seal system