District officials said 70-75 ft trench has been dug so far to gain access to Thimmanna Hatti, who is trapped at a depth of 160 feet in the 300-ft borewell.
Vacuum pump has been brought from Bagalkot Municipal Corporation to clear the mud covering the boy, officials said.
The boy's distraught father Hanumantha Hatti sought stopping the rescue operations to dig a parallel, pit-cum-tunnel in L shape, saying he is almost certain his son is no more.
"To get this pit closed, I may have to again go for huge loan. With great difficulty I have come to this decision. Let this work be stopped," he said.
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District in-charge Minister S R Patil, who is overseeing the operation, said, "the father is in great pain, He is saying all this may be in emotional mood of not being able to save his son and also seeing his land being dug up."
A robotic equipment team lead by Manikanthan from Madurai is being roped in to help in rescue operation, officials said. A similar attempt using robot to pull out the boy failed yesterday.
Thimmanna fell into the borewell in his father's sugarcane field while he was with his cousin on Sunday.