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The storage tunnel is supposed to keep 75 million gallons of slop out of the water each year.

So the prisoners then escalated the protest, refusing to "slop out" the chamber pots left in their cells, as there were no toilets.

Prisoners then escalate the protest, refusing to slop out the chamber pots in their cells - they daub excreta on the walls and pour urine under the cell doors.

The report said queues could be long and a prisoner's "only other option is to use a pot in his cell and then to 'slop out' in the morning".

The prison was open from 1846 until 1996, when it was closed because it didn’t meet new human rights regulations — a lack of toilet facilities in the cells meant prisoners had to “slop out” chamber pots twice a day.