Beck tunnel boring machine/Definition
Jump to navigation
Jump to search
![](http://s9.addthis.com/button1-share.gif)
The largest tunnel boring machine in the world, when it was operated by Ontario Hydro, from 2006 to 2011, bored a 14.4 m (47.24 ft) diameter tunnel from the upper Niagara River to the Sir Adam Beck Hydroelectric Plant