500ft borewell dried up in Nalgonda district, Andhra Pradesh: Need help finding geologist/equipment for underground water survey

I own 16 acres of land in Nalgonda district of Andhra Pradesh, 100kms away from Hyderabad. We have a 500 feet borewell that has dried up.
Please help me find a geologist and the best of the best technology/equipment used for underground water survey in or around Hyderabad.

I shall be extremely thankful.

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