normally, when we think wall, we think ground level and up. Some exterior walls usually have part of the wall below ground. How many feet do you guys think it would need to go below the surface? 15 or 20 ft above the surface but how far down? No one really mentions that part, just food for thought.
This whole other stuff is just the tip of the iceberg that has been ongoing for a long long time. I am going to guess since before the Egyptian Pharoahs.
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There is a massive tunnel network throughout most of DC (at least) see the underground section of this post for some pics and video of nearby dupont underground and links to info about the bigger maze.. The whole block is above an "abandoned" tunnel system, and that includes a construction company with experience in reinforced underground tunnels..
It really is just the tip of the iceberg..