Northfield Mountain Tunnel Portal

Northfield Mountain Tunnel Portal (Google Maps)
Northfield Mountain Tunnel Portal (Birds Eye)
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By skyeye @ 2007-10-29 21:45:11
Northfield Mountain pumped storage hydro plant contains an underground generating station blasted out of gneiss. The powerhouse is accessible through a 2,500-foot-long tunnel. Seven hundred feet below the surface, the cavern is longer than a football field and higher than a ten-story building.

The image shows the service road entering the only access to the tunnel. The underground powerhouse flooded during construction in 1972 and suffered a fire in 2002:
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skyeye picture
@ 2009-06-25 19:52:10
Here's a superior view of the portal;