Excavation is now underway near Exhibition Station for the Ontario Line’s TBM launch site. A 16-m deep shaft will become the starting point for two TBMs that will dig a roughly 6 km pair of twin tunnels - the first subway tunnel project to start in Toronto’s downtown core in more than 60 years. 

Two twin tunnels created by the TBMs will run from just east of Exhibition Station to just west of the Don River. Following tunnelling, the launch shaft will become the portal where Ontario Line trains will transition, travelling east, from above to below ground. 

When complete, the Ontario Line will be a 15.6-km subway that will bring 227,500 more people in Toronto within walking distance to transit. Click here  and ca/41 for the tunnelbuilder archive. Visit https://www.metrolinx.com/.50/24.