Ok, so I managed to get back into Cidhna Mine by using a glitch. I took a plate and used the Whirlwind shout with all three words and went through the door. From there I was attacked by the people in the prison and discovered that the ore counts as a bed (Which is insane!) I managed to get back out by the same method.
What is your thoughts on this (And feel free to try it yourself, if you want?)