even the haiti earthquake, we found people. as long as people are willing to take chances. we heard void spaces and people making sounds as of last night. >> they say they did hear sounds yesterday, but so far i'm told they haven't heard any sounds today. what does that say to you? >> it could be a shift in the sand. a shift in the sand could close that sound transferring from one place to the other. so as the time goes off, we may come back to hearing those same victims asking for help. >> reporter: because us through exactly what your colleagues are doing right now? it's still officially called a search and rescue operation as opposed to the baz news when it becomes a recovery operation. >> absolutely. which saddens everybody's heart, including responders. they're finding a way to get on top of the pile. they're dropping sonar to detect