These strange structures were not visible on 5/8/2012. They appear afterwards, very recent. Structures seem to be on top on the ground, maybe just a bunch of prefab "boxes" painted?
The 2 bunkers slightly to the north of the "grid" seem to be finished.
New grid like structure
This map has better detail in Google Earth than Google Maps
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© Bing Maps
By nico @ 2012-11-12 21:27:57
mlc1us
@ 2012-11-13 08:25:21
Google Earth Historical Imagery 11/13/2012