4.3.1.   The Drapića Ponor-cave.

We were greatly surprised to observe the complexity and the large dimensions of the Ponor-cave system beneath this mill. As previously described, the Turbine Chamber offers two ways forward via lintelled portals, into what appears to be separate cave systems - although they must be hydrologically connected.
We start with what we have described above as the south portal, located at the far left-hand corner of the Turbine Chamber as it is entered. The portal is a cave rift and leads along a level rock-strewn floor to the top of a shaft. The neo-vertical shaft, which continues above as an aven, can be descended using a hand-line. The shaft is roughly eliptical in cross-section, having diameters of 2m x 3m. The free-climb down is about 13m deep, where a mud bank floor is encountered. The passage is then walkable for a few metres around a sharp corner, where a further short climb down over a 3m deep vertical rock wall is encoiuntered. The passage is essentially the original shaft which takes on a corkscrew effect about its mid axis. Doubling back under the original shaft, one is met with sudden vast blackness as the passage opens up into an enormous chamber of indeterminable size.
Further reconnaissance was made impossible by the prevailing situation on the surface.

This series of passages was neo-horizontal in comparison with those previously described. Additionally, we recorded cave life-forms in this section of the ponor-cave.

4.3.2   The Perišića Ponor-cave.

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