Authorities on July 28 had detected the tunnel at a depth of 25 ft below the ground level along the Indo-Pak border in Samba district of Jammu and Kashmir.
The tunnel was detected when an area near Chillayari Border Out Post caved-in at two-three places after rains.
The tunnel, with a dimension of 3x3 ft and having air supply through 2-inch pipe, has been dug out between two sides along the international border on India's Chillayari Border Out Post and Pakistan's Numberiyal Border Out Post.
"We have requested experts from Army authorities, GSI, Geo-physics and seismology departments besides Geology and Mining to conduct digging to find out the extension and opening of the tunnel," Inspector General, BSF Headquarters, New Delhi, S K Mishra told reporters at Chillary Border Out Post here.
Besides these officials, help would be also sought from satellite imagery from ISRO, Mishra said adding that, "we will later take further action after it".
"We have been digging the tunnel further. We don't know where is tunnel going, where is its opening point...We did not found so far," the IG said.
"The alignment is straight towards border fencing -- if you have seen the alignment, the tunnel is extending towards the border...So far, we have have reached the middle of the tunnel," he said
The BSF official, who led the team from Delhi for inspection of site in Chachwal border hamlet, said the tunnel was constructed possibly with the purpose of infiltration and smuggling into Indian side.
Meanwhile, fear has gripped locals in the border area after the discovery of the tunnel. (More)