asscciation for mexican cave studies box 7672 ut station austin ...

above the roaring cascades. At times the upper route woUld give out and wewould be back in the canals swimming for 50 m or so at a time. Sections ofthis. nassage had the most remarkable solution flutting any of US had ever seen.Half mete.r wide blades would project from passage walls and extend verticallyfor 10 m or so. In other places the rock was dissolved so it formed only askeleton of what used to be the stream floor. The thinner projections of rockin these areas sometimes were less than 5 cm in diameter, yet 1 m long! Thismade going extremely difficult as it was impossible to tell when a footholdwas going to break off~ We soon reached our two hour limit and commenced thesurvey. Some four hours later we connected with the other team and headed out.It was 6:45 a.m., Sunday. At 9 a.m. we reached the Junction Room. Wetsuittops were again dropped here for the finaJ push. Everyone was back at Camp I~y noon concluding a 21 hour trip.· Realizing that we could be underground asmuch as three more days Johnson headed for San Agustin to inform the surfacecrew. We were originally due to leave the cave the following morning. Thecamp crew then hit the hammocks for another 18 hour sleeping blitz.Our eiRhth day underground was spent in camp repairing equipment. Severalof us had ·bought new Viet Nam boots (Korean made) for the expedition and wereastounded at their state of disrepair after only two weeks of caving. Three orfour hours work with a sewing awl usually returned them to a functional state.Wetsuits, unfortunately, could not be repaired since they never dried out enoughfor the glue to hold.BOREHOLE! Johnson arrived at 11:30 a.m. on Tuesday with news that it had beenraining hard. The rainy season was due soon. Carbide and food were also gettinglow. This would be the last trip of the season. Along with some extraprovisions he had brought in a hand calculator. A half hour's work showed thefurthest survey station to be 542 m (1778 feet) below the entrance. La Grietawas now the 2nd deepest cave in the hemisphere. We suited-up for the last timeand smoothly negotiated the now familiar passage. Within four hours we reachedthe limit of exploration. The stream canyon led on just as before: canals andcascades. This time it was Steele, Zeman and Horowitz in the lead planning aminimum four hour exploration blitz before surveying back. One rule we had beenenforcing this trip (as always) was that all explored passage be surveyed. Johnson,Stiles and I began surveying in. We soon came to an apparent sump. Johnsonwent freeclimbing high up the wall and I went low, not sure of where the othershad gone. The passage continued beneath the ledge with a 5 cm airspace. Wedove this one too, arriving at the top of another 10 m cascade. For the next1/2 km we surveyed through more canals and cascades. Gradually we left the waterand began traversing large breakdown. With each survey shot the passage openedup until all we could see was a great· blackness ahead beneath the 15 m higharched roof. For close to six hours we had nothing but 30 m survey shots. Theroar of the river could always be heard below the breakdown. Speculation ranrampant. Was this part of some old super system? Whatever it was, it was biggerand longer than any known passa~e on the plateau and heading down on a steep150 dip. San Agustin was not far away, but if we continued on this dip therewas a possibility of going underneath. Our speculation was never answered forwe soon heard the push team. They were just as dazed as us. Beyond the trunkpassage continued even more cave of similar dimensions (20 m x 15 m), but· theyhadn't followed it. Several hundred meters further they had descended a riftleading into a steeply dropping chamber over 60 m wide. At the bottom theyencountered another cascade and canal passage. From there they surveyed out.15