Trained dogs offer sniff of a chance

It was more than 72 hours after the quake and no cry for help could be heard from the rubble of Beichuan Middle School amid the din of heavy machinery around.

A rescue team from Chongqing was doing a last search on the school's collapsed main building, giving up hope of any survivors - when a sniffer dog barked.

Rescuers started moving heavy concrete chunks at the spot and two hours later, they found a girl in coma, her legs wounded badly, but still breathing.