As Garrett is looking for tracks in the short, thin layer of dut, he notices something about the geometric patterns on the walls. They are actually a very, very slight bad-relief raised off the walls and behind them are a thin layer if piping and tubing, from which he can feel a very soft breeze that runs counter to that of the entrance. Finding one with out such a current, he blows into it softly... And is rewarded with an equally soft note.