Dark but not unlit. Endless corridors. Like a morgue or a bomb shelter. Or Cold War era NORAD style command centers. This is not a mine. Labyrinthine. There is a perceptible symmetry to the corridors but no obvious way to navigate them; not to their center nor to the edge that leads out again. There is no smell. Wander slowly, wander fast. Not alone but also not imminently in danger. But something chases. Underground like this, there is always a pursuer.