Four-year-old boy Nirbhay, who fell into a 220-foot-deep borewell in Dhanaura village of Haryana's Ambala district, was declared brought dead at the hospital. His body was retrieved from the nine-inch-wide shaft in early hours of Wednesday after a 21-hour-long operation by NDRF, SDRF, local police and the Army. He was accompanying his father to the fields when the incident happened.