Shots of the 'supermax' prison where El Chapo might be held Mexican drug lord Joaquin "El Chapo" Guzmán might go to the Administrative Maximum Facility (ADX) in Florence, Colorado if he is sentence to life in prison on June 25. Also referred to as "supermax" or the "Alcatraz of the Rockies," the prison holds more than 400 inmates, specializes in preventing escape and is considered one of the most secure prisons in the US. IMAGES