Digging for life in Colombia's quake zone

It's Wednesday morning here at the Torres del Limonar housing complex in the south of Cali. And as you can see, rescue work is ongoing here. In the initial hours after the quake, local firefighters and neighbors managed to pull 20 people out from this building. And after the arrival of more rescue teams and more resources, they were able to rescue a few more. So this has been a site where people have been saved. There have also, unfortunately, been bodies removed from the housing complex here, which was two towers, one four stories high and one five stories high. There are a lot of community volunteers here interested in helping. And yesterday they were distributing water, bringing food to rescuers, all kinds of supplies. That's been hugely helpful for local authorities, but there's also been concerns about the number of people that are here at this site. You can hear that heavy machinery in the background. They're using a backhoe to remove some of the debris and truck it out to the city dumps so they can keep searching for survivors. Today, the environment is a little bit more controlled. We almost weren't able to get in as journalists, but they're being much stricter about who's able to enter and why. In a bid to control especially the weight that's being put on the structure, there are civilians who are helping firefighters search. Mostly young men, but there were some concerns about the number of people on top of the structure itself and how that might affect either survivors who are below all of that rubble, or the ability, especially the ability, for firefighters and rescuers to hear those survivors. They regularly hear a call for silence and raise their fists. That's the universal sign in earthquakes for silence. That's how firefighters and search and rescue professionals can listen for any noise and scratching, any screaming, any shouting, anyone banging on the rubble around them. That helps them, obviously, locate people and be able to bring them out.