Its just simple electro-seismic surveying equipment able to do what drilling down does to do sampling, up to many thousands of feet below the surface of the earth. Each sample point then allows 3D gridding to occur, giving a very good view in 3D what all is down there. So where are those coordinates where the alleged active computer locations are? I could do a high res satellite for surface anomalies but I'd rather hear what you have. Take a look at the last post I did on the Dulce thread in PA for an example of some gridding done to -3000 feet.