very cool. >> very cool. >> brown: jamie shreeve, set is scene for us. this was an accidental finding. >> pretty much. a couple of cavers exploring the cave site that's been looked at, people trained in it, it's very well known, and they came across a little opening that's only 8 inches wide in some places. took a step down and another and realized it just kept going down. so they dropped into this cavern that had never been explored for, you know, who knows how long, and they found the floor of this cave littered with bones, with homonid bones. >> brown: becca peixotto, that's where you come in. is it true your opinion brought in through social media? there was a call for people to do this work? >> there was an ad on facebook to find archeologist, people qualified -- >> brown: from facebook to this kind of a find. >> exactly. so small archeologists who had technical skills in climbing and caving, and that's an unusual skill set to have excavation skills and be comfortable working in a cave. >> brown: this is not your usual area. >> true. i'm usually wor