80 feet of borewell casing came out while cleaning it with compressor

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A 350 feet of borewell was dug in our campus. We got water and casing was lowered after cleaning was statrted with an compressor. After an hour or so 80 feet of casing was thrown out of the borewell. 

What could be the cause?

India Water Portal
www.indiawaterportal.org