How do you get in the wall at omashu in avatar the burning earth

Go into the sewers,
and go up to the big wall in the middle. Make sure you're right up against the
wall, and go to the right side and start running to the left. After about 5-10
seconds, you phase right through the wall. Once you're through, if you go up a
little and then to the left, you can reach the northern part of the sewers by
running under the left side until you get pushed through. You can use this
glitch to explore the rest of Omashu without triggering the cutscene(s) with
the guards and Gito. It'll also be daytime as well, so you can see the town
during the day.