Through the galleries of the lower, water part of the cave, the Peklenščica Stream is running, forming many rapids and small pools. Spacious chambers and narrow passages lead to the end of the cave. The cave ends with a siphon from which a 4-metre high waterfall is bursting. It is the highest underground waterfall in Slovenia that is accessible from such vicinity. In the water cave many stalactites, stalagmites and columns can be seen, as well as calcite crystals that glitter wonderfully in the light.
When you walk through the lower part of the cave, the sound of water is always there. The only exception is Tihi rov (eng. the silent gallery) which is completely silent and has great acoustics.