first, sarah smith. a warning-- some of the scenes may be disturbing. >> reporter: waiting outside the main hospital, injured people can only hope for treatment. everyone here has suffered some sort of ordeal, especially roberto rossi. after three terrifying days and nights trapped under a wall in her own home, roberta was finally dragged out of there today. she says she had been screaming for help, but no one could hear her. only when a bulldozer arrived this morning did they spot her pushing a stick out of the wreckage. neighbors dug her out, shocked, but relatively unhurt. like so many others, though, she now has nowhere to go. it seems as though most of the people who live in port-au- prince are now forced to live out on the street. and just about every public space and even patches of waste ground, these makeshift shelters have appeared and people are surviving on only what they could grab from their collapsing homes. so, food, water and all kinds of supplies are running out quickly, and if they don