ADX: The World's Most Impenetrable Prison - El Chapo's New Home?
El Chapo may serve life sentence in Colorado 'Supermax' prison - TomoNews
Controversial ‘Supermax’ prison known for extreme isolation
Inmates attack guards in brawl at Chicago supermax prison | USA
A super-maximum security (supermax) or administrative maximum (ADX) prison is a "control-unit" prison, or a unit within prisons, which represent the most secure levels of custody in the prison systems of certain countries. This is often the most secure form of security within a certain prison system. The objective is to provide long-term, segregated housing for inmates classified as the highest security risks in the prison system—the "worst of the worst" criminals—and those who pose an extremely serious threat to both national and global security.