to test their model, widmer and storey follow guide arturo sandoval to the limestone caves of copan. storey: all we know about the caves surrounding the copan valley is that some of them were explored in the 1890s by an archaeologist named gordon. and in some of them he found what he thought was very early pottery and some human skeletons. widmer: well, here it is. storey: yeah. widmer: it's a little bigger than i thought it would be. storey: it sure is. widmer: okay, here's the entrance. i'll tell you what, rebecca -- i'll go in first. you can hand the lantern down to me. storey: that's a good idea. yeah. go ahead. widmer: it's not as tight as it looks, but it does go down. keach: storey and widmer reach the first small chamber. gordon reported that he found the bones and pots in a second chamber beyond this one. storey: looks like a tighter fit than the other one. widmer: oh, yeah, it is. storey: looks longer, too. widmer: yeah, but i can see the bottom. don't see any bats. well, i'm standing in gordon's test pit. storey: human bone. there is human bone here, yes. keach: the cave f