i'm joined by dr. sanjay gupta. one of the blessings of having you is you get good reporting as you're giving us expertise on the medical side. we were mentioning the analogs here. we were both in haiti when we watched the same diggers and first responders pull people out after 72 hours of a pancake collapse. that's what they're hoping for. >> they are. they're realistic, but this is very much a search and rescue mission still. i mean, as you know, it's hard to time these things out. someone is in a void, protected from the elements, has access to clean air and access to even water. there's been rain, obviously. there's been water. it's possible. it depends on the level of the injury. mostly blunt trauma injuries is what we're hearing from medical examiners, and it depends the resilience before. it's possible. it's possible, but 24 hours, as you know, statistically that's