Mexican drug lord Joaquin “El Chapo” Guzmán could be headed to Colorado’s notorious ADX Florence “Supermax” prison when he is sentenced June 25. The cartel kingpin was convicted Tuesday on 10 counts of smuggling-related charges, including sending a half-million pounds of cocaine into the U.S. over three decades. Former warden Bob Hood told NBC News, “There’s no question in my mind that Guzmán will be going to the Supermax prison in Colorado.” The prison, known as “Alcatraz of the Rockies” has the tightest security in the U.S. and home to Boston bomber Dzhokhar Tsarnaev, Unabomber Ted Kaczynski, and 1993 World Trade Center attacker Ramzi Yousef, who are serving life sentences there. Most of the penitentiary’s prison cells are just 7-foot by 12-foot and have only a small 4-inch window with no view of the sky, Hood said. Inmates who pose a security risk are allowed just one hour of recreation time in a small cage outside their cells. Guzmán will likely not be allowed visitors and have little or no interaction with other inmates, Hood said.