On the road to Zadar I saw approximately twenty Italian World War II bunkers outside of the city and made a note of them on my map.
Among the gun emplacements I found discarded shells the length of your index finger and the occasional animal's skeleton. I've mentioned previously that I always carry a headlamp for such occasions and on this day I really needed it. Each concrete bunker had two chambers - one with three narrow windows to fire from and a second room in the heart of the bunker. Across the narrow windows was written "La Volonta, costanza, sacrificio, la gloria", "the will, constancy, sacrifice, the glory".
There was one large facility the size of a house. The building had three rooms of approximately 6x6 metres and one long chamber of length 30m. In the long section was a raised wooden walkway overlooking nine cubic enclosures. Each cell was 10ft deep as noted by the gradation scale on the walls and was open only at the top; you can see five of them here. These cells were not large enough to detain a person but possibly could confine an animal. There were large 3500L drums of liquid in each alcove behind me and given the cubic-structure measuring scale, it is possible that these containers were used to fill each cell. It is only speculation but one answer could be to dissolve something, or someone. I didn't open the drums in case it was acid or another volatile substance but I have many pictures of the facility; please get in touch if you have any information on such a place.
Two thirds of the way along the catwalk the steel supports crumbled and I fell through the floor. Anticipating this possibility, I was walking along the edge holding onto the wall to support myself. The subterranean crawl-space was full of cobwebs. It was incredibly confined and pitch black without my lamp. On my hands and knees I proceeded to the end.
After nearly a century of stagnation there were stalactites on the ceiling and the heavy steel doors had corroded making it impossible to move some of them. It was a thoroughly exciting day.