Corrections officers at the privately run Acacia Prison east of Perth found the hole. No prisoners escaped, the Australian Broadcasting Corp., said Saturday
The prison, though medium security, houses inmates convicted of murder and sexual assault. It employs a campus design that permits prisoners to move around using electronic key cards to track their movement.
John Welch, secretary of the Australian prison guard union, said the incident is concerning and faulted poor staffing and the nation's privatization of corrections facilities for the security lapse.
"These are not common garden fences," he said. "They're not the sort of fence you're able to cut through with a small set of scissors so it's clearly taken a considerable amount of time and effort."
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