Inside England's Top-Secret Turbine Testing Site

These photographs show the inside of what's left of England's once top-secret turbine testing site. Check out the Star Wars-esque blast doors...
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"Although all is quiet here now, for over half a century the National Gas Turbine Establishment at Pyestock saw all kinds of turbine engines pass through its doors. Everything from Royal Navy turbines to Concorde engines were tested in specially built chambers on site. Even captured Soviet engines were examined here discreetly. During its operational years, the importance the facility held to both the national security and commercial air transport sector of Great Britain cannot be overestimated."