in the past she fought with a powerful spirit called General Old Iron, to prevent him from destroying a city that once stood in the refinery's present location. Old Iron initially sought to wipe out the humans, believing that they would threaten the existence of the spirits if left unchecked but was talked out of it by his friend and fellow spirit Lady Tienhai. After Tienhai's death, which was said to have come about as a result of the humans of the city, Old Iron sought to avenge her by destroying the city, but Yangchen made a deal with him that stopped him from doing so. Before she can explain the terms of the deal, another earthquake disrupts the ceremonial meal, causing the vision to end. Elsewhere, Toph talks with her father, telling him about her role in training and helping Aang in an attempt to make him see her for who she really is, but after he makes no response, she decides to have nothing more to do with him. At that moment, Katara and Sokka arrive to try and convince Lao to evacuate the iron mine, which is dangerously unsafe. It emerges that Lao knew nothing about the iron mine; Loban has been operating it in secret after Lao felt that extracting the iron would be too dangerous. As they attempt to evacuate the workers, they are attacked by a member of the Rough Rhinos, causing a cave-in that leaves almost everyone trapped in the mine. Toph manages to save the group from being crushed to death with her earthbending and metalbending, but she is unable to move the vast amount of earth away from them, and Aang is unable to help her, due to large amounts of iron ore mixed in with the earth that he is unable to move with his earthbending. Part Three The people trapped in the mine are saved by the efforts of Aang, Toph, Penga, Ho Tun, and The Dark One. Before they arrive, Lao makes amends with Toph, apologizing for all his past actions. During the rescue, it is revealed that the iron ore is in fact General Old Iron's armour, which he discarded after making his deal with Yangchen. Loban, finding that all the iron has been dug up, attempts to escape to the Fire Nation with it. At that moment, a storm begins to develop. Aang attempts to get