The chamber is dim, and very tall. You are lying on your back, strapped to a table. Suddenly, you hear mechanical noises from an enormous machine. As you watch, transfixed with terror, you see a huge shaft with a gigantic, curved blade swing over you, glinting in the light of a single lantern with each stroke, before vanishing in the darkness. At first, it swings by several feet over your chest, but then you notice that with each swing, a metallic clunking accompanies a horrible, inexorable descent toward your chest.