How to know whether water inside borewell has really dried up or is there any possibilities of getting water after redrilling?

My question is how to know whether the water inside the borewell has really dried up or is there any possibilities of getting water after re-drilling it deeper?
Our borewell is inside the house, i.e., in the car garage. Are there any technologies that can dig the bore deeper without damaging the walls or roof?

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