The garbage depot is the former base of the Resistance and formerly where garbage was taken to be processed.
The Resistance celebrated Lloyd's speech. They started planning on who else they could recruit to help them. When Dareth felt left out, he asked Mystake for tea that can give him power.
When Dareth went outside to relieve himself, he saw the depot ambushed by the Sons of Garmadon.
- Though garbage trucks have been seen in Ninjago before, the depot's first true appearance was in Season 9.