This facility is located in the Santa Juana Centro neighborhood of Almoloya de Juárez, in the State of Mexico,[2] 25 kilometers (16 mi) from Toluca.
[3] The prison was built between 1988 and 1990 under President Carlos Salinas de Gortari and received its first inmates in November 1991.
Furthermore, the air space near the facility is restricted, and the authorities claim that cell phone transmissions are limited within 10 km (6.2 mi) of the prison to stymie communications between the inmates and their colleagues outside.
Additionally, armored personnel carriers are based near the facility to protect it during a potential assault.
[citation needed] This prison was thought to be impenetrable until July 11, 2015, when Joaquín "El Chapo" Guzmán escaped through a tunnel.