A 61-km stretch of a riverine border that India and Bangladesh shares on the Brahmaputra in lower Assam was essentially porous until now, allowing infiltrators and smugglers easy entry into the country. But that's about to change. In a fitting example of how man and machine can together make the country's borders smarter, Border Security Force (BSF) personnel will now keep the volatile patch under enhanced surveillance with the help of indigenously developed equipment.