Hundreds of volunteers, soldiers and police are digging and tunnelling into the precarious, pancaked ruins of a collapsed Mexico City school where at least 25 students and teachers were killed in a magnitude 7.1 quake. Volunteer rescue worker Pedro Serrano, a doctor, was one of the rescuers who managed to crawl into the crevices of the pile of rubble that had been the school. Serrano managed to make it into a collapsed classroom — only to find all of its occupants dead. The overall death toll from the quake stands at 248.