once they get to who's called chamber three, it is basically dry from then on, but you imagine going up through a jagged, i don't know, mountain range in new mexico. that's the kind of thing that we're talking about underground. so this is no walk in the park, and one boy when he came out yesterday had to be treated at the mouth of the cave because he just wasn't feeling up to it. and he was one of the strongest. the things they've gone through extraordinary. the divers, too. remember, one died. they've been drilling the walls of the cave. they've been diverting the river channels so when the rain that came down yesterday and last night went into the cave, it didn't actually flood the kids' cave. it was diverted away. you know, when the rescue commander says this is a masterpiece, pardon the exaggeration, but he's not far off the truth, guys. >> it is really remarkable.