Fujichrome Sensia 100, OM-2S, 21mm super wide angle lens, bulb setting at f/3.5, one Press 22 and one GE Mazda 21 foil flashbulb, tripod.
"Undoubtedly the largest single piece of breakdown I've ever witnessed, this geologically recent rockfall dominates the talus pile of the Third Chamber. If one looks closely at another image of the chamber, one can plainly the scar left by the fallen boulder."