Call of Duty: Modern Warfare 3 Easter Egg - Hidden Scenery underneath Fallen map

You must use theater in order to find it. After playing a match in Fallen, preview the match in theater mode. Pause the video at any time, and use Free Roam where you can fly around the map away from any of the players. Near the edge of the map where a water tower is in the background,there is a broken down blue Volkswagen Beetle near a fence. Look towards the middle of the map and you will see a building with 2 garages next to each other. The left one is Green and the right one a brown with and octagon shaped sign saying "BHHMaHHe" . Run the camera into the green garage and look down, you will notice a gap between the pavement and the building. If you position the camera to look underneath the pavement you will notice what looks like an entire map beneath Fallen. There are large buildings on both sides, a forest in front of both buildings, and a large structure that reminds me of a boat separating both forests. There are also road ways between the forest and buildings. There appears to be a logo on the side of the right building that I can't tell what it is from, but it was put there intentionally. It reminds me of an Aztec or Mayan design.