Episode 22 part 1:

 Dharma's Journey:

While making preparations, Dharma chooses to be transparent about his mission with Wu Hana to Neila and Bhaga. Bhaga comments that they're still not sure about her loyalties to protecting the camp, and entrusts Dharma to do the right thing and watch her.

Dharma and Wu Hana move southward, crossing into the Fire-Nation controlled territoy stretching from Pohuai to the staging area south of Taku. Dharma fakes being a citizen fleeing with his grandmother, and the Fire Nation soldiers buy it and escort them through the fringes of the camp lines.

They overhear talk of prisoners having been captured and being interrogated for information. Wu Hana stresses they should move on and forget them, and Dharma, moving back towards survivalist-mode, agrees.

They continue on and meet a group of refugees. Dharma explains there are pockets of people pushing against the Fire Nation and points them in the direction of the camp without divulging more information about it. Wu Hana is skeptical they'll survive the Fire Nation encampments.

At the edge of the Great Divide, both use their bending to easily navigate into the canyons. They follow the trail the Wu Hana has and eventually come to a dark cave....

Shizaku and Moshi play COOs:

After Nue notes that all the original designs and notes for Shizaku's engines have been taken by the military, the group (Moshi, Shizaku, Gyara, and Nue) deliberate on options. Shizaku considers having some kind of schematic or stealing ore but that might be more difficult from a military installation. It's finally decided to try and steal an older prototype they can rebuild and retrofit.

Moshi uses his investigative skills to sniff out word of an old derelict yard on a nearby island protected by private security. He and Gyara plan to sail in, find an engine, hoist it out, and move out. They manage to hoodwink the guards, but the military patrol on leaving Shu Jing proves more problematic. While trying to leave the shut-down port, they are roped into a missive to bring back goods for the military from the continent, and although Kazu, the Navy overseer in the region, is skeptical, he lets the ship pass.

They return to the Hidden Docks of Shimoni Dhato and bring the engine to Shizaku's workshop so that they can install it on Gyara's ship.