Diego Garcia harbors more than one secret, some reports claim that the military is harboring an underwater base that allegedly utilizes alien technology. There seems to be photographic evidence of the existence of under water bases as well. A Popular Mechanics investigation TRACKED DOWN SOME OF THE MOST INTERESTING ACTIVE MILITARY FACILITIES AND SPOKE WITH BRAD SCHULZ, VICE PRESIDENT OF FEDERAL ARCHITECTURE AT HNTB. HERE IS WHAT SHULTZ HAD TO SAY ABOUT DIEGO GARCIA.
For more on the story also read: http://www.thetruthdenied.com/news/2015/03/07/diego-garcia-a-black-project-military-base-with-secrets-to-hide/