I walk down the utterly dark tunnel, my flashlight the only source of illumination. The tunnel is long and narrow and vaulted overhead. The white paint on the walls has deteriorated over the years and a bunch of rusty metal clamps are all that remains of the previous lighting system. As I come closer to the end I can sense a faint glow somewhere, when I reach it, it turns out to be a crossroads. I go to the left because it’s shorter and there is light in that direction. It leads to a small open space within a low semi circular wall and a set of tracks on the ground. I turn back and move past the entrance tunnel towards the next spot of light. It is a similar open semi circle and I realize now that the tracks probably belonged to a retractable canon of some kind. Once again I go back to the main pathway but this time there is no light at the end of the tunnel…. let’s find out out what is there.