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These included part of a ventilation system falling from the ceiling, an event the boss of Co-op Live Tim Leiweke said could have been "catastrophic".

The report also stated the "ventilation systems in the showers and kitchen areas were insufficient" and that "these issues contribute to an unsatisfactory environment for the inmates".

But because the garden was all enclosed, the roses never got proper ventilation and always developed problems.

One of the most famous involved Frank Morris, and brothers Clarence and John Anglin, who escaped in June 1962 by placing papier-mâché heads in their beds and breaking out through ventilation ducts.

For an hour, he sat on the train, the doors closed, until people could pry them open to let in ventilation.