Tunnel borers have been at work in Toronto for years, with more to come as our subway system expands. Donnie probably weighs about 400 tonnes and would be something like 10 metres long. This machine was assigned to drill The Coxwell By-pass Tunnel to stop storm overflows of sewage into Lake Ontario, thus improving Toronto’s waterways. This project is part of the $3-billion Don River and Central Waterfront Project. Way to go, Donnie!