Deep rescue
Workers guide one of the vertical pieces of the modular lift tower into place. The tower will hoist the front end of Bertha, the SR 99 tunneling machine, out of the ground 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... -
Bertha reaches her stopping point in the SR 99 tunnel access pit, clearing... -
Workers guide one of the vertical pieces of the modular lift tower into... -
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