Terran service platform X21 - 21BA was a construction site for a large dock until it was invaded by Zerg. Later Tassadar and Jim Raynor came here. A extraction team lead by Xel'kraeas and Aldaris and the Executor came to capture Tassadar for his actions. A large force of Zerg came up from tunnels and attacked the party. Xel'kraeas cut a swathe through the Zerg and the party got on the extraction shuttle with Tassadar. Over one thousand Zerg resided here.