Deep rescue
A welder cuts off one of the SR 99 tunneling machine’s cutting bits in March 2015. The cutting bit will be replaced temporarily by one of several lifting hooks that will allow crews to lift Bertha’s cutterhead and the cutter drive unit in one piece to the surface for repairs.
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A welder cuts off one of the SR 99 tunneling machine’s cutting bits in March... -
On Dec. 9, 2014, crews started installing the vertical pieces of the modular... -
Workers guide one of the vertical pieces of the modular lift tower into... -
Bertha reaches her stopping point in the SR 99 tunnel access pit, clearing... -
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