The "Communication Hub" is an ancient place that was once used by the Homeworld Gems thousands of years ago to communicate through space. It was located somewhere in the middle of a desert. The place made its first appearance in the episode "Coach Steven", when Sugilite demolished it with her flail. The Crystal Gems visited it again in "Cry for Help" after discovering a transmission from Peridot, seeing that she had managed to partially repair it and use it for transmitting messages to Homeworld for Yellow Diamond to receive.