Enter Casuarina maximum security: the toughest jail in Western Australia and the scene of one of the bloodiest prison riots in Australia's history. With capacity at an all-time high, the cell blocks are overflowing; Casuarina is designed for 400 inmates, it currently houses over 600 serial killers, sex offenders and terrorists. This 'supermax' doesn't just house the worst criminals in WA, they're among the worst in the country.