Skyrim Wiki

Cidhna Mine

Cidhna Mine is a silver mine and has a reputation as the most secure prison in all of Skyrim. It is located under the city of Markarth and cannot be entered by the Dragonborn until the quest 'No One Escapes Cidhna Mine' is initiated, prompting the player to be jailed for life.

Cidhna Mine is home to jailed murderers, thieves, and Forsworn. There is an evergoing trade for Skooma and shivs going on under the guard's noses, and both items are very much valued within the walls of Cidhna Mine.