A Supermax prison is a unit that houses prisoners considered to be too dangerous either to themselves or other prisoners in a regular prison. Regular prison, which isolates prisoners too dangerous for regular society. In the United States, the ADX Florence is the last federal Supermax and the toughest prison in the country. Home to dangerous men like Drug kingpin Joaquín "El Chapo" Guzmán. Life inside the Alcatraz of the Rockies, as it is called, is just what you'd expect, and yet shocking all the same.