Check the borewell casing

How to know if the bore well casing has collapsed ?

Dear Sir,

We dug a borewell in 2017 upto 290 feet of 6 inch. After a year, the submersible pump got stuck. Now, we have recovered the pump and again dug up to 350 feet. After the bore well digging process, we tried to place the submersible pump into it, but it got stuck at 80 feet and the casing is up to 100 feet . Can any one please suggest whether this is because of the casing ?

Thank you