But like the Berlin Wall or Israel's West Bank barrier, the planned 485-kilometer (300-mile) trench is giving physical form to a border that locals have long seen as artificial, dividing families and crippling trade. And it is adding to simmering tensions between Afghanistan and Pakistan, US allies which have long accused each other of turning a blind eye to insurgents.
The trench runs along part of the 2,640-kilometer (2,640-mile) Durand Line, named for British diplomat Mortimer Durand, who drew the now internationally recognised border in an agreement with Afghan ruler Abdur Raham Khan in 1893. But the modern Afghan government has never accepted the border, and neither have the mainly tribal communities that straddle it. They are accustomed to moving back and forth freely and in some cases own land on both sides.
Pakistan's Frontier Corps said in a recent statement that the trench would "not only help in effectively controlling the movement of drug and arms and ammunition smugglers, but also will help in stopping the intrusion of terrorists and illegal immigrants." Pakistan fears that arms could make their way to any number of insurgent groups, including the Taliban.
"The people here have never accepted the Pakistan-Afghanistan border in the first place," said Gen. Abdul Raziq, the police chief of Afghanistan's Kandahar province, which borders Baluchistan.
"Pakistan is not doing anything to stop terrorism. If they want to stop it, they should stop producing it," said Raziq, who has long had a reputation for ruthlessness in battling the Taliban.
Pakistan insists it is committed to fighting extremist groups and points to a massive offensive it launched in the tribal region of North Waziristan along the Afghan border over the summer. But analysts have long said Islamabad differentiates between the Pakistani Taliban, with which it is at war, and the Afghan Taliban, which it quietly tolerates and views as a means of preserving its influence in Kabul.
