in the courtyard area of the school hundreds of workers are moving debris away from the school under adaner that says unity creates strength. then a whistle cuts through the air j everyone stops. notice silence. this gives rescue teams crawling through the structure the chance to listen for survivors. the work inside the building is treacherous. wooding pillars have been brought in to fort fie wlags left of the school. hector says his team arrived on the scene an hour after the school collapsed, and the 70-year-old volunteer believers more people will be pulled out alive. do you think you'll be able to find children alive in there? >> yes, the children the most time they got more chance than we adult people. >> reporter: you think so, even