Check out this great video from McGraw-Hill Construction on tunneling for the 2nd Avenue Subway project on the eastside of Manhattan. The tunnel boring machines are kind of big, eh?

Soil conditions are very different in New York than in Los Angeles, but the video gives a good basic idea about tunneling as Metro ramps up for construction of the Westside Subway Extension.

And here’s a good story on the 2nd Avenue Subway project on ENR.com.