Current borewell is at 420 ft and 6 inch diameter, and is fully dry - Need suggestion to redrill it upto 800 ft

Dear Sir,
We have a borewell drilled one year back before construction of a house at Bangalore. Now construction is completed & borewell is located inside the house. We had good source but later due to another bore drilled by the government very close to ours for public water, our bore has completely dried. I need you sugestion to re-drill the same bore well upto 800ft. Details : our bore is upto 420ft, casing upto 120ft later completely stone upto 420ft. Dia is 6inch. Other bore is up to 750ft with 6 inch.

Regards,
Chandra
9986369867

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