The GPS coordinates point to the cave. From the gas station in Pazin, continue on the road north-east towards Novaki Pazinski. This road crosses the train tracks a twice within 1.7km. Right before it goes under the train tracks a third time (the train tracks are on the bridge), there's a dirt road on the left. Follow this dirt road 200m to reach a little parking lot. The road is 2WD accessible. The cave is just 50m further. If you come in the wrong season, you'll hear the waterfall and know where the lake/cave is to be found.