even now, 100 years later, unexploded ordnance, shells are being discovered and detonated by explosiveseen. this is a corner of europe where first world war shells explode every working day. the belgian bomb disposal teams based in the village of poelkapelle deal with at least 200 tonnes of unexploded munitions each year. you may think that after 100 years, this iron harvest would be reducing. it's simply not true. during the first world war, along the western front, 1.5 billion shells were fired and, of those, one in three failed to explode. that left 500 million still in the ground. a few miles from poelkapelle, another call. one third of the munitions that the team recover contain chemicals such as mustard gas. the firstjob is to clean them up, and not always that gently, to get a rough idea of how dangerous they might be. the next step is an x—ray. you can see now the bottle. this the chemical. cyanide or arsenic. around is explosive. even after 100 years, lives are at risk here. the chemical shells are eventually destroyed in a sealed chamber. conventional explosives follow a separ