I must have been having a brain cramp.
You are going to make your cellar deeper and do this by making a combination of 3' footings?
I would consult a structural engineer.
I do not know how you would tie the three foot sections together to provide the strenth that you would need to support the house?
I think I would go back to my first post and jack the whole house.
Maybe I missing something here.
Let's hear from some others on this.
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