 In this promotional short for the MGM feature _Point Blank (1967)_ (qv), the "rock" of the title is Alcatraz Island, which housed a US federal prison that closed in 1963. Alcatraz is one of the many locations used in the feature film. As this short opens, former Alcatraz prisoner  John Giles (II)  (qv) tells what life was like for the inmates. Director  John Boorman  (qv) and several of the film s stars voice their own thoughts about being at Alcatraz for location shooting.