Borewell collapse in Bangalore - 600 ft borewell covered with mud upto 200 ft - How can we fix this problem?

I am from Bangalore. Recently we have drilled bore upto 600 ft, water source is 1.5 inch, after the drilling, the next day we measured the depth for installing motor, the rope tied with stone stopped at 200 ft from ground level, water source is available at 180ft from ground level.

Yesterday we did scanning of borewell & found that the mud had fallen from top & closed at 200ft, please advice

What is the solution to fix the problem?

Regards,

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