After having good wine and pasta at malga Montasio hut, go for the cache!
The cache is hidden inside the cavern!
The easiest way is to take the normal entrance and find the cache via spoiler picture!
If you are a small person, you will fit through the "window" at the cache koordinates. In this case you do not have to go through the whole cavern.
Vafvqr gur pnirea, arkg gb gur jvaqbj...