Prison cube

Prison cubes were a technology utilized by Terran Confederacy frontier colonies and backwater planets in order to transport prisoners when police dropships were either impractical or too expensive. They had magnetic axles, hover technology that would keep them stable at speeds of up to 480 kilometers an hour, a controlled-temperature environment, support for all biological needs, and clean, purified oxygen replenished every 30 minutes. The bars were electrified to prevent prisoners from trying to break out, and they had the ability to be hitched to vulture bikes.

Jim Raynor utilized one of these to transport the prisoners Marduke Saul, T-Bone Smalls and Rodney Oseen across Perdition's Crossing.