Interesting read on how close Norte-Dame came to collapsing and an great example of illustrative story telling on the web.
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July 17, 2019
Notre-Dame came far closer to collapsing than people knew. This is how it was saved.
The employee monitoring the smoke alarm panel at Notre-Dame cathedral was just three days on the job when the red warning light flashed on the evening of April 15: "Feu." Fire. It was 6:18 on a Monday, the week before Easter. The Rev. Jean-Pierre Caveau was celebrating Mass before hundreds of worshipers and visitors, and the employee radioed a church guard who was standing just a few feet from the altar.