On Friday morning, May 2, Vatican workers were seen hoisting a chimney onto the roof at the Sistine Chapel, according to photos and video taken by Reuters. The chimney will soon be used to display the smoke from burnt ballots during the conclave to elect Pope Francis’ successor.

The Vatican is finalizing preparations for the May 7 conclave, with firefighters on Friday installing a chimney on the roof of the Sistine Chapel.

Workers installed the chimney for the papal smoke signals onto the roof of the Sistine Chapel ahead of the conclave that will elect the next pope. The smoke from the chimney will announce to the outside world whether a new pope has been decided among the sequestered cardinals.