http://news.bbc.co.uk/panorama/hi/front_page/newsid_9378000/9378563.stm US Marines revisit 'bomb alley' Three months after British forces in Afghanistan handed over control of Sangin to the Americans, reporter Ben Anderson went on patrol with the US 3rd Battalion 5th Marines "Lima Company" in the area still widely viewed as the country's most dangerous. No-one knew it yet, but we were standing on a "daisy chain" of seven home-made bombs, buried inches beneath our feet and designed to wipe out the entire squad of US marines. The bombs were attached to a wire, which led down an alleyway off the path we were nervously inching along. Somewhere, someone with a battery at the other end of that wire was watching us, waiting for the perfect moment to connect the circuit and detonate the bombs. We had tried to avoid walking through this very corner, knowing full well such obvious routes are favoured by the Taliban in placing their IEDs. But there was no other way forward. Roughly 20 metres past the corner, there was a huge explosion behind me. PANORAMA: FIND OUT MORE Ben Anderson reports from Afghanistan The Battle for Bomb Alley BBC One, Monday, 31 January at 2030GMT Or watch it later via the I turned and saw the air thick with swirling dust. Stones and rocks started landing all around. As the air began to clear I saw a crater, and could hear someone groaning. I walked back and saw a marine known as "Big T" on his hands and knees, patting the ground around him, trying to work out where he was. Somehow, no one had been killed - the marines walking behind me were all standing between the IEDs when they went off. Big T was severely concussed, and temporarily blind and deaf. Two others had been badly shaken, but it seemed miraculous that no one was dead. It was four days after Christmas. Familiar path The area claimed the lives of 106 British soldiers in four years. In the three months since the US forces took over from British troops, more than 20% of the combat power of 3rd Battalion 5th Marines in Sangin have been killed or injured. The town's reputation as the most dangerous place in Afghanistan is undimmed by the arrival of Marine muscle and firepower. So far, 27 have died and more than 140 have been injured. These numbers are staggering, even by Sangin standards.