agurcia: the next thing we knew, we hit this incredible building. keach: what agurcia found astounded him -- the roof of a buried building, decorated with elaborate plaster sculpture. but before he can interpret the imagery, he must first deal with more urgent problems. we have a number of problems with dealing with this. one is the working conditions, because the air is so thin and tight in here that i'd like to come in with tunneling from the exterior so we can get better ventilation and be able to work with greater ease, ease the heat and get us some more oxygen. the other thing is that we are so close up to this giant mass that it's hard to interpret. it's hard to get a feel for the message on it. we are exposing so little of it, and this was designed, this was made to be seen from a long distance. this was a big building. we are talking something that probably went up as high as 4 or 5 stories on a modern building. so it's hard to be able to decipher the message from this close and seeing so little of it. we're going to need a lot more exposure