On Guard - Stories From Inside Australia's Toughest PrisonsAustralia’s prisons are notoriously private — inmates are forbidden from talking to the outside world without permission, and officers are silenced by airtight contracts. On Guard — an eight-part podcast — uncovers what really goes on behind bars as former correctional officers share shocking secrets from the frontline of working with some of Australia’s most infamous criminals. These are the unsung heroes of the justice system, men and women who risk their lives daily -- often without thanks. Some of their stories are terrifying, others are haunting ... and some are very, very funny.