One of the many long-abandoned chalk mines in Norwich. Disused since the end of the Second World War, some go back to the twelfth century. Apparently, this mine was the last to be discontinued.
Deep, cold, and black as death down there. On a warm day up top, I could see my breath in the torchlight down there. A few times, I would switch my torch off, just to allow the sheer underground darkness to overwhelm me. Unsettling, but cool.