Sounds like you have enough supports, just have to secure those sections before they move like that one did.
The forces imposed on the soil is dispersed in a 45 degree angle, so when undercut, like in the photos, no doubt in those soils, (sand or fine soils ?) could easily do what you have shown.
I see you have the others concerned about your methods, for a residential, home you have bent the rules a tad, but having extra columns, a decent size beam, worst case scenario already happened, no one was in the way and nothing compromised, though you are brave for posting here for unduly reminders of safe methods.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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