Funny story about these catacombs. When I photographed the catacombs it looks like I was standing in them. I achieved this effect by putting the camera on the end of a long pole. A policeman in the sentry box of the police station, across the road, saw me doing this, and asked what I was doing? I said I was taking pictures, but I don't think he heard me. He then shouted over that he had given the museum a call and that they would come and assist.

Sure enough, 10 minutes later, two people appear. By this time I am very excited at the thought of being able to explore the catacombs. One of the people from the museum opens a gate in the glass panels, and jumps down. They don't let me follow, and soon he reappears. He asked me what I had dropped. I was momentarily puzzled, but then the penny dropped. The policeman hadn't heard me when I said I was taking pictures, and assumed I was using a long stick to fish something out that I had dropped/ He phoned the museum who came out to help me. 

I explained what had happened. and  naturally asked if I could have a look around the catacombs now that they were here, but unfortunately I wasn't allowed. Luckily, they didn't seem to mind that it had wasted part of their day.