The Border Security Force is continuously working to develop counter-drone and anti-tunnel technologies to effectively check cross-border drugs and arms smuggling and terrorist infiltration bids along the India-Pakistan border, force chief Pankaj Kumar Singh said on Friday. The BSF director-general said the force has shot down a total of 7 drones over the last six months (December 2021-May 2022) and has detected three underground tunnels along the Pakistan border between January 2021 to May 2022.