enough so that portions of the cave became walkable. on top of that, there were still areas that were still under water, and that's where these divers have been doing exactly what experts have been counseling for days. put the boys in full face masks, and then as they entered the submerged portions of the cave, as we understand it, what happened was one diver would go in front, carrying the air supply for that boy, pulling the boy along behind him, and the other diver would come behind. that's how they went from that many people in the cave to this many people being out, which is a big improvement, dana. >> no question. and you have that graphic up there. do you have any sense -- i know it's hard to get a sense of what the conditions are inside. but in terms of the length and how far these rescuers had to travel and these four boys had to travel back to get out. >> yeah, the maps are all over the place. they're kind of a mess. but by some accounts, as much as