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This is the dramatic moment an inmate weighing nearly 20 stone attacked prisoner officers during an eight-hour "rampage" that took 100 prison officers in riot gear to stop.
Inmate John Onyemaechi, who is serving a double life sentence, went on the massive rampage at HMP Full Sutton, one of the UK's most secure jails, on August 9 last year.
Officers were forced to throw pyrotechnics and use pepper spray to distract the convict as they attempted to bring him under control during the riot.
Footage shown in court this week shows Onyemaechi hitting an officer over the head with a pan from behind while he was unlocking a gate.
His keys were still in the lock as the inmate repeatedly struck him, causing the key chain to snap as the officer slumped down.