"We have detected a well-constructed tunnel on International Border (IB) in RS Pura sector of Jammu district today," a senior BSF officer said.
This is the fourth tunnel unearthed by the BSF in the region since 2012.
"We were carrying out our regular clearing operations, done monthly, when we found a well-constructed tunnel," he said, adding that it was being dug out with JCB.
"We were suspecting some activities across the border. There were late night movements. People used to come late in night to the post across".
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"But it was blocked on our side. It was dead end. It had no exit as they could not complete it further. It came close to the border fencing," the officer said.
"One person can sit and easily move inside the tunnel which has came up in the vicinity of Allah-Mai-Di-Kothi BoP of ours from Pakistan Post of Afzal, he said, adding that a probe was on.
Earlier, BSF had detected a 400-metre long cross-border tunnel along the International Border in July 2012 in Samba sector.
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The BSF, in a statement in Delhi, said the force is already on high alert on western borders and is working proactively to thwart any misadventure by anti-national elements.
After a detailed vulnerability analysis, the sensitive regions have been mapped yet again and special measures are now in place to counter any security threats.
"Efforts are on to check the complete layout and design of the tunnel. Senior officers are camping on the place of detection," it added.