Restoration of the Sistine Chapel frescoes smoke and exhaust fumes of the city, being "much dirtier than the ceiling proper". The building was a little unstable and had already shifted considerably prior to Michelangelo's work of 1508, causing cracking of the ceiling, the crack in the "Judith" pendentive being so large that it had to be filled with bricks and mortar before painting. The upper part of the ceiling provided Michelangelo an irregular surface due to cracks and water seepage. Continued ingress of water from the roof and from unroofed exterior walkways above the ceiling level had caused seepage which carried down salts from the building
Sistine Chapel Rome by mercenary forces of the Holy Roman Empire in 1527, and the Council of Trent which commenced in 1545. The work was designed on a grand scale, and spans the entire wall behind the altar of the Sistine Chapel. The painting depicts the second coming of Christ on the Day of Judgment as described in the Revelation of John, Chapter 20. High on the wall is the heroic figure of Christ, with the saints clustered in groups around him. At the bottom left of the painting the dead are raised from their graves and ascend to be judged. To