Spelunkers scrambling around large cubical-shape blocks, that detached from the cave ceiling. The landscape is beautiful in this part of the cave, and I wish I had more time to take long-exposure photos. But we didn't stop so I could only snap a few shots at high ISO.
Photo taken in the Clearwater cave system in Gunung Mulu National Park (Borneo)
The Clearwater System is believed to be the largest interconnected cave system in the world by volume and the 9th longest cave in the world at 189 Km (as of 2011).
For more photos, information and cave map, view my Clearwater cave photo series.