The Celtic League claims the Manx Government is breaching United Nations guidelines on the treatment of prisoners by housing adult and juvenile offenders together in prison.
Director of Information Bernard Moffatt says overcrowding at Victoria Road (pictured) has forced the move.
In the past, men and women have been forced to share wings because of an accommodation crisis.
Mr Moffatt says that was bad enough, but the present situation is even worse:
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28% reduction in violent crime linked to drugs
Motorists urged to slow down on resurfaced roads
DoI says restrictions will be in place until next week
Island starts introduction of digital immigration products
From July status will be recorded digitally
Ratepayers urged to join conversation over NCAS
Bride Commissioners hosting 'open session'
Firefighters raise £2.7K by completing 'Station to Summit' endeavor
'Casualty' transported up North Barrule for charity