Stumbled upon this today while browsing : The secrets of Laurel Hill revealed
Older article (Racecar Engineering Mar 2011) but found it interesting none the less...
Video from outside while testing ongoing : http://www.youtube.com/watch?v=s-f_0...layer_embeddedThe rolling hills of Pennsylvania in the Northern United States hold a mysterious secret buried deep under Laurel Ridge. This highly classified test site is re-writing the textbooks on aerodynamic development. The construction of the site took place in 2003 and rumours of existence first surfaced a year later