Tartarus

Tartarus is a prison-planet in Alpha Sector, and a founding member of the Galactic Correctional Agency. It is one of Perdition's two moons. Tartarus is not a standard prison-world, it instead traps the inmate's mind in a virtual world by utilizing wireless computer networks, in conjunction with brain implants. This method is used for heavily violent lifers, but also for rich or at-risk inmates in order to keep them from being injured.