My driveway had settled over the years, at the point where it met the garage, it was dropped 1-4 inches.
They come in and drill small holes in the concrete and pump in basically spray foam insulation, except it is a more precise and dense mixture than what you get in the cans at the hardware store.
They used to do something similar, except use local soil mixed with concrete, this new technique is better and lasts longer, and not any more expensive.
I think it might have been me that asked for a progress report. I have a rental property where a small section of the driveway has cracked and fallen. I assume its because there is now a small void under the concrete. I believe they can just do the same thing…drill holes and fill with high pressure foam to restore to the original condition.