I have a 1950 1000 sq. ft. concrete block (foundation and walls) house with a crawlspace. The crawlspace is about 3'. I want to dig it out to about 6', just in one corner (one 10' x 12' "room"). The problem - my footings are down only about 1'. That means I would be 2' below the footings. My thought - dig it out but stay about a foot from the inside edge of the footing, and then pour a concrete floor which would run up the sides to the footing, with some sort of re-bar or mesh. Aort of a knee wall as part of the concrete floor, inside the foundation. This would keep the earth contained under the footing, and prevent the ground under the footing from collapsing inward.