At 57.5 ft diameter, the sheer size and weight of the tunnel boring machine was too great to salvage from the exit shaft. Over the next four months, crews worked alternating shifts 24/7 to methodically dismantle Bertha piece by piece. 

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SR99 tunnel exit site following the completion of TBM dismantle process, view to south.

SR99 tunnel exit site following the completion of TBM dismantle process, view to south.