The cache is hidden on site where used to be an ex Yugoslav army radar site. The radar itself was removed after operation Oluja. The site is abandoned. For better understanding please read http://www.zeljava-lybi.com/Zeljava-RP%20Pljesevica_eng.html. Map of the site is here http://jimblog.com.hr/wp-content/uploads/2013/06/pljesevelika.jpg.
Cache box is in the first room under the radar site from which the tunnel leads to the main building.
It is almost a drive in cache. The road is most suitable for an 4x4 but a car with good ground clearance can manage the road.
To find the cache it is not necessary to enter to dangerous parts of facility, just first room. Be careful. There are a lot of debris. Enter at your own risk. Some road is on BIH groun so have your papers with you.
Some additional photos.
Please visit related cache Objekt99 and Zeljava airfield.
Some additional links: 1 2
Mountaineering cachers have a good marked (2013) path to the top. Read good description or download gpx track.