Caving activity would be explore rock of stalactites, which is a type of secondary minerals that hangs from the ceiling of limestone caves. In fact, there are stalactites that grow at the bottom and be like a pillar. Some karst rock is alive and dripping water. Pindul divided into three zones, namely Zone bright, dim and dark. One part Pindul there is quite wide so it looks like the pool and there is a considerable gap incoming sunlight.