To all who happen upon this:
If everything goes according to plan, I am now a former occupant of this cell. It took me months to gather the spell components to create a way out, but my work is complete. For those newly-arrived, the Daedra commence nightly openings of the cages—to taunt us. When it happens tonight, I will unleash my spell and crush the eastern wall.
I was a former guard, and I can say with certainty that the caverns beyond are the most direct route out.
Freedom awaits. Remember the eastern wall.