Interesting find today. Had a garage turned into living space, and there was an additional room in the back. The room was about 15x15, and the added a bath. Got under the crawlspace and discovered the entire slab for this room was being suported by the foundation walls, with nothing in the middle.
The dirt had settled around 4 inches. I could see all the way across to the block on the other side. :shock:
They had dug out some for the plumbing in one corner, but the rest was just open space.