Ty Lee questions whether the earthbenders guarding the Outer Wall are capable of halting it, to which Qin objects by stating that the drill's metal shell is impervious to any earthbending attack, emphasizing his point by striking the periscope Ty Lee was looking through. War Minister Qin boasts about the drill's magnificent ingenuity and its capability of breaching the walls of Ba Sing Se. The command module for the drill ascends from the top, where congregated inside are Mai, Ty Lee, Azula, War Minister Qin, and several Fire Nation soldiers operating the machine. Steam is released from its pipes and metal spikes lodge into the surrounding land. Several segments of the drill extend forward, elongating the machine. Several Fire Nation tundra tanks rumble across the rugged terrain toward the Outer Wall of Ba Sing Se, the enormous Fire Nation drill following close behind. Meanwhile, Jet wishes to recruit Zuko as a member of the Freedom Fighters, only to learn Zuko and Iroh are firebenders.

Aang and the group succeed in demolishing the drill from the inside of the mechanism. However, he discovers a Fire Nation drill heading straight for Ba Sing Se, intent on destroying the wall. Having successfully navigated the Serpent's Pass, Aang is determined to journey to Ba Sing Se in the hopes of finding his lost bison, Appa.

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