Or had they been startled by this section of the wall below?
Once inside the tunnel, it was surprising to see how large a space it opened into. Fortunately, the event organizers had lighting set up in most areas where no sunlight entered the interior, but one still had to exercise caution due to poor footing. Eventually, we arrived at a section where there must have been a split in traffic.
Soon after, we passed an area, accessible only by ladder, in which water covered the entire floor [image below]. This was shot through a chain link fence next to the ladder. I don’t know for what purpose this room served.
Next week I will conclude our tour.