tunnel-boring


bertha-resumes-digging-alaskan-way-viaduct
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
Excavation stopped on Big Bertha repair pit due to major ground sinkage in area
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Subway expansion in Delhi to set record with simultaneous use of 34 tunnel-boring machines
Caterpillar to layoff 300 at mining facility in Illinois, close tunneling plant in Toronto