Openings meant for the prestressing cables, 1964
            
            Société d’histoire des Îles-Percées
Prestressing was applied on only three sides of the caissons to give the structure flexibility as it was lowered underwater.
            
            Société d’histoire des Îles-Percées
Prestressing was applied on only three sides of the caissons to give the structure flexibility as it was lowered underwater.