Cyan. Everything was cyan. Three men awoke in a tunnel, stretching as far in either direction as they could see, ending in black. On the ground around them, there is nothing but rocks. On the ceiling, a gooey cyan substance glowed dimly. It is the only source of light. Flipping a coin, they head in a random direction. Stopping at leisure, dipping into the food-filled backpacks they brought for an expected camping trip that clearly didn't pan out. The men grow tired and weak. There is no sense of night, day, or time at all. How long they walked is anyone's guess.