see the big hole for the DC Water Tunnel Boring Machine

From DC Water:                         
                 

Lady Bird TBM ‏@LadyBirdTBM  3m3 minutes ago

How do you get a TBM 160 feet below First Street NW to dig a tunnel for #BloomingdaleDC? Down here.

4:27 PM - 23 Mar 2015

That’s a Big Hole!