World’s Largest Hard Rock TBM
Successfully Surmounts Challenging Rock
- Contractor Strabag AG completed its 10.4 km (6.5 mi) drive below Niagara Falls in May 2011
- Crews successfully contained over-break and falling rock, using a customized ground support program
- The machine achieved a world record in its size class by excavating 467 m (1,525 ft) per month