[VIDEO] Watch Workers Change Cutting Teeth on Seattle Tunneling Machine Bertha

This July 2016 video shows crews from Seattle Tunnel Partners performing routine maintenance on Bertha, the SR 99 tunneling machine. This work must be completed in hyperbaric conditions similar to those found in an underwater dive.

Jul 13, 2016

This July 2016 video shows crews from Seattle Tunnel Partners performing routine maintenance on Bertha, the SR 99 tunneling machine. Crews must regularly inspect and replace the tools that scrape away at the earth in front of the machine. This work must be completed in hyperbaric conditions similar to those found in an underwater dive.

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Crews worked Monday, Aug. 24, 2015 to begin one of four crane operations to lower Bertha's cutter head and drive unit back into the ground. Once the giant tunnel boring machine is back together and tested, it will start tunneling again Nov. 23, nearly two years after it stopped 1,000 feet into the nearly two-mile tunnel project. This wide shot shows the giant 'super crane' used to first pull the 4-million-pound cutter head out of the ground and now to lower it back in.
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