Detonation experts say shells from World War One along the French countryside could still explode -- even one hundred years later.<br/> <br />(SOUNDBITE) (French) BOMB CLEARANCE SPECIALIST GUY MOMPER SAYING:<br/> <br />"If you have a million shells falling -- besides all those that fell after -- the soil's upheaval necessarily buried a large part of those which did not explode."<br/> <br />They say it could take one hundred years or more to clear this area in northeastern France.<br/> <br />Locals have come across countless shells themselves.<br/> <br />(SOUNDBITE) (French) RESIDENT OF SAMOGNEUX ROLAND DABIT SAYING:<br/> <br />"This is nothing, this is nothing. I can't tell you how many I find sometimes. Even in the forest. How many are there in the forest? How many? Believe me when we go mushroom picking, I see a hundred shells."<br/> <br />The Metz center specializes in the removal and detonation shells, grenades and mortars from a century ago.<br/> <br />(NAT SOUND OF BLAST)<br/> <br />In 2007, two experts were killed while tr
