SpiralBound
Explorer
It took me a while to find these islands via Google maps (and conspiracy theorists would have a field day with the odd mistures of available and unavailable section of the various islands... ) However THIS specific satellite view just SCREAMS "secret research facility"! 
http://maps.google.com/?ie=UTF8&ll=-40.349623,-9.880539&spn=0.001885,0.003659&t=k&om=1

http://maps.google.com/?ie=UTF8&ll=-40.349623,-9.880539&spn=0.001885,0.003659&t=k&om=1