There are no modern sliding metal doors here. Built in 1802 with cell renovations in 1855 everything is hammered steel bars, and reinforced wood.
You do walk through a few cages before entering the main hallways.
The only known escape I could find was the well published one by highwayman and murder John Fisher. His wife was imprisoned with him, the famous (beautiful) Lavinia Fisher. When she could not escape out the windows with her husband he returned in the morning, to be hanged soon after. Lavinia was a nasty piece of work and later 30 – 40 bodies were found buried under their tavern.
Oh, they hung her too even though it was rare to execute married women. Stories have her hung the day after John that way she was not married.