At the source of the Gljun stream turn left and after 20 minutes’ walk you will reach the entrance.

It is a 750 m long web of:
- cave galleries,
- shell fossils,
- megalodontites;

There is a lower and an upper entrance,
with a difference in height of 65 m.

In heavy rainfall a waterfall flows from the upper entrance.

Visits are possible only with proper equipment and an experienced guide who can be found and hired in all sports agencies in Bovec.