The Engineering News & Record has released a two-part video tour of the ongoing construction of a three-tunnel subway project totalling $15 bilion.  The subway expansion includes a $4.5 billion Second Avenue Subway, a $7.3 billion East Side access, and a $2.1 billion No. 7 line subway extension.

The clips, especially Part 2, are very interesting– check them out:

Tunnel Tour video clip Part 1 (run time 4:40)– Touring the first phase of the Second Avenue Subway extension

Tunnel Tour video clip Part 2 (run time 5:06)– Touring the East Side access, scheduled to be complete by September 2016

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Photo:  Alewife Red Line Subway Station by Freephoto.com via Creative Commons License.