Jan. 13 update: Filling in shaft number three
Today, crews filled in the third of three shafts drilled last week in front of Bertha, the SR 99 tunneling machine. The shafts were drilled to further identify the limits of any metal in front of the machine and remove as much of it as possible. Plans to drill a fourth shaft have been put on hold as crews prepare to perform an inspection within the machine’s excavation chamber.
Crews are also continuing to change cutting tools and perform other maintenance within the machine.