Inside Wan Shi Tong's Library, Sokka discovered a small burned piece of parchment which read, "The Darkest Day in Fire Nation History" and had a date on top of it. After that, he discovered that the whole wing dedicated to the Fire Nation had been burned down, thus preventing him from finding out what happened on that day. One of the Knowledge Seekers arrived and led Sokka and the others to the planetary room. The fox creature entered through a small opening to the right of the large golden room, and opened it from the inside. When the foursome entered, the fox showed them how the planetary room worked by pushing a lever. Zei exclaimed that the room was a "true marvel; a mechanical wonder". Katara suggested that Sokka enter the date he found on the parchment onto the dials in the middle of