The penal colony on Titan was used by Mega-City One to incarcerate bent Judges. It was also a working mining colony, sending metallised hydrogen and other minerals back to Mega-City One. While Titan would become the mandatory sentence for corrupt Judges, in 2079/80 only a few were sent there and the majority were civilian prisoners from various mega-cities. The "Titan treatment" - being disfigured and modified to breath the atmosphere without a spacesuit - was only done to prisoners as a punishment. Rico Dredd and a bus load of prisoners and guards were trapped on the moon after a hailstorm, with Rico helping get the survivors free. Corrupt guards began killing prisoners on their march to safety in order to preserve oxygen for themselves and Rico was left as the only survivor, after killin