Pics show El Salvador’s mega-prison that can house 40,000 inmates. Pictures show El Salvador's Terrorism Confinement Center (CECOT), a mega-prison opened in February 2023 that can accommodate up to 40,000 inmates. The prison, located in Tecoluca, houses gang members, including those from criminal gangs MS-13 and its rival Barrio 18. Human rights groups have criticised the prison's harsh conditions.