An Exclusive Look Inside the Recovery Efforts to Save Notre Dame

Nearly three months after a fire gutted Notre-Dame Cathedral in Paris, the building’s chief architect has warned that there is still a risk that the historic building's ceiling arches might yet collapse, causing severe structural damage.

“The risk is that all the vaults up there fall. It is that simple,” says Philippe Villeneuve, chief architect of Notre-Dame, who led TIME on a tour of the fire-ravaged cathedral.

Nearly three months after a fire gutted Notre-Dame Cathedral in Paris, the building’s chief architect has warned that there is still a risk that the historic building's ceiling arches might yet collapse, causing severe structural damage. “The risk is that all the vaults up there fall. It is that simple,” says Philippe Villeneuve, chief architect of Notre-Dame, who led TIME on a tour of the fire-ravaged cathedral.