I’m watching Avatar: The Last Airbender 3×14 “Chapter Fourteen: The Boiling Rock, Part 1” https://trakt.tv/shows/avatar-the-last-airbender/seasons/3/episodes/14
Sokka wants to break his father out of jail and asks Zuko for information on Fire Nation prisons. Sokka and Zuko head for the Boiling Rock, a prison located in the middle of a volcano, to rescue Sokka's father.