This missive from the inmates had lain in the ceiling structures of the niche of the second floor of the spectator hall. It was discovered by accident during renovations in March 2005.
The Tagil residents knew that for the hardest labor that did not call for special skills, the unpaid labor of the inmates of Tagil Labor Camp was used. The old timers tell that early in the morning horse-drawn carts would arrive with slave labor force, and at dusk the same carts would go back -- to the prison colonies of the Brick towhship and Tagil outskirts. Brave souls were found who would throw bread and potatoes over the fence that surrounded the construction zone. According to Lev Samuilovich Libenstein who worked in 1950's in a construction state enterprise and managed the erection of buildings on the Theater Square, the inmates, who had their right to correspondence removed, immured bottles with their letters under one of the columns. What was written in them -- no one knows...
Translation, from Russian, is mine.