Thunder can feel the floor as she approaches it. It's very, very lightly warmed, especially in comparison to the air outside.<br/><br/>But that's not quite where her goal is.  She's looking for a sound, and follow the path. First in its general direction, then when she can feel it better, to the west. It takes her past the warm water, and a full floor down it feels like. There's some strange warped space that would have made navigating much more difficult for a lesser person.<br/><br/>For her, it was utterly trivial to navigate around. From this staircase, it was north to the cracking noise, and south to where the water was getting warmer. Although, about halfway to the source of that noise, the water becomes very, very chill. The closer the colder, until it's so cold that she can feel the ice floating around ceiling level.<br/><br/>There's an obstacle in the way in the form of an ice encrusted door.