Forty-four hours after four-year-old Mahi was trapped in a 70-feet deep borewell in Manesar town near Gurgaon, modern technology was deployed on Friday evening to locate her exact position, an official said.
"On Friday evening, experts with Ground Penetrating Radar System (GPRS) were called to assist the rescue team. It is a technology that provides critical information on potential obstructions within existing underground structures with three-dimensional images," said a senior officer who was part of the rescue team.
Earlier, the big bore machine from Rapid Metro achieved its target of digging a l75-feet tunnel parallel to the borewell in the early hours of Friday.
"The gap between both the bores is about 8-feet. While digging the tunnel to reach the target (Mahi), from new bore to borewell, a big piece of hill stone became a big barrier. Due to this, the rescue team missed the goal," the officer further added.
An army Engineer regiment from Delhi and National Security Guard (NSG) personnel have taken on the task of rescuing the child.
According to an official, an extra supply of oxygen was provided through a pipe to Mahi and army men inside the tunnel.
Mahi slipped into the borewell near Manesar's Industrial Model Township (IMT) on National Highway-8, when her family was celebrating her birthday around 11pm on Wednesday.
Mahi is the daughter of Niraj Upadhyay, who hails from Uttar Pradesh's Aligarh district. Niraj is a security supervisor at a factory in Manesar and was living in Kasan village with his wife Sonia and another two-year-old daughter.
Police have booked the plot owner, Rohtash Singh, a resident of Najafgarh in New Delhi.
Despite several raids, he could not be arrested, said Om Prakash, Manesar station house officer.