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  • big bertha tunnel map - emefoundation.org

    Inslee orders tunnel dig halted as soil sinks above Bertha ... ... seattle big bertha tunnelbig bertha tunnel boring machine; big bertha tunnel boring machine history;

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  • big bertha tunnel machine in seattle - emefoundation.org

    Feb 18, 2015 ยท Seattle's massive tunnel boring machine Bertha, ... the massive five-story-tall machine that will dig the SR 99 tunnel underneath ...

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