This cache will lead you to a gallery of an abandoned coal mine near Luka Plomin. The header coordinates will show you the adit entrance. To reach the location of the header coordinates (where you can also park your car) just follow the sign to "Klavar" from Luka Plomin. After you have passed the canal, turn to the right side and follow the unpaved road to the coordinates. From the point shown by the header coordinates you have to walk about 700 meters (about 900 - 1000 steps) into the adit until you will reach the final location, indicated by a supporting wall MADE OF BRICKS on the RIGHT side of the gallery. The cache is hidden on top of the beginning of this supporting wall.
Please, take a look at the spoiler pics as the GPS doesn't work inside the mine!
Take a good torch with you!
Good luck! Sretno! Glück auf!