A caisson being towed to the immersion barge, 1965
![Boats towing a structure](https://www.communitystories.ca/v2/pont-tunnel-louis-hippolyte-lafontaine_bridge/wp-content/uploads/sites/130/2020/01/PrtScr-capture_19.jpg)
Société d’histoire des Îles-Percées
When the dry dock was flooded and the caissons floated to the surface, the dike was dynamited so they could be towed away to be immersed.
Société d’histoire des Îles-Percées
When the dry dock was flooded and the caissons floated to the surface, the dike was dynamited so they could be towed away to be immersed.