Inside El Salvador's mega-prison for gang members

Dramatic footage has emerged from inside El Salvador's mega-prison for gang members showing its concrete confinement cell and impenetrable security.

The Centre for the Confinement of Terrorism (CECOT) in Tecoluca is home to 40,000 of the world's most dangerous men who will never be released - each one with at least one homicide conviction.

And now has offered one of the most in-depth looks at the prison's interior yet.

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