The following account was recorded in the agent's log during your transmission: Gigantic, hollowed-out stalactites somehow support a series of abandoned, rusty monorail cars in this massive underground cavern, their metal exteriors reflecting a faint, bluish-green bioluminescence emanating from patches of iridescent moss clinging to the damp stone walls. Umm, the air's heavy with a weird, metallic tang and a low, electric hum, kinda like ozone but not quite, and it's really still, with a slow, steady drip of water echoing off the walls. The monorails' doors are open, revealing empty seats, except one's got a large, ornate shrine dedicated to Lord Cygnus, patron deity of forgotten knowledge, somehow intact despite the surrounding decay.