State Route 99


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Damage to Big Bertha worse than previously thought
Big Bertha wakes from one-year nap, begins to chew her way into repair pit
Big Bertha's delays have pushed back the opening of the tunnel it's digging by 20 months...so far
equipment damage From our partners
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Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Repairs to Big Bertha will include 86 tons of steel reinforcement to tunnel-boring machine's bearing, cutter drive
A steel pipe is what brought Big Bertha, the world's largest tunnel-boring machine, to a halt