This cave is close to the village of Planina, at the end of the Planinsko Polje. The entrance is about 100m high and is located close to an imposing round watch-tower on the River Pivka (pronounced 'Puke-a'!)

A short way inside the cave is an iron gate which must be scaled before further exploration can take place! Further in, the way splits into two with the Pivka taking the right hand branch and the Rak coming in from the left. After only a few metres along the Rak, the path ends at a series of chambers reached by a dodgy traverse wire. At the far end of these chambers, the Rak flows upstream through 12 x 18m high passages to an incredibly clear shrimp-infested sump.

We did not explore the Pivka branch.