It's pitch-black . The more she went through, the darker it got . Luckily, Lily has specially trained to be in the dark, so even though the light is very dim, she can see it all quite clearly
Fumbling around a column-shaped thing for about an incense time, Lily took a few turns and estimated the right direction and location . She looked at the staunch iron door in front and saw that it had a sophisticated combination lock . The corners of Lily's mouth faintly delineated a provocative smile; it was a joke to want to speak to her about locks