Book 2 Chapter 13 "THE DRILL"

Aang reunites with his friends intent on stopping the drill. Though their offer to help is initially refused by the Earth Kingdom general at the Outer Wall, Team Avatar begins finding a way to take down the drill. They determine the best way is to sabotage the drill from the inside, then deliver a final blow to the top of the structure to take it down. Battling Azula, Mai and Ty Lee, Aang successfully stops the drill with it still plugging the hole in the outer wall. Meanwhile, Jet wishes to recruit Zuko for his Freedom Fighters, but Zuko bluntly refuses. Jet becomes suspicious of the two when he deduces that Iroh heated his own cup of tea using firebending. Jet becomes intent on exposing Zuko and Iroh, while Team Avatar makes their way into Ba Sing Se.