Big Becky breaks through at Niagara Tunnel

摘要

After four years of tunneling beneath Niagara Falls, Ontario, the tunnel boring machine (TBM) named Big Becky broke through to daylight on May 13. The machine is the largest rock TBM in the world. Ontario Power Generation's (OPG) Niagara Tunnel is one of Ontario's largest clean energy projects. This design/build project is a 10.2-km (6.3-mile), 12.8-m- (42-ft-) diameter water diversion tunnel for hydropower generation and includes associated intake and outlet works.