An underwater tunnel project between Hochelaga and Longueuil, 1880
![A sketch of an underwater tunnel with boats on the surface](https://www.communitystories.ca/v2/pont-tunnel-louis-hippolyte-lafontaine_bridge/wp-content/uploads/sites/130/2020/01/PrtScr-capture_12-2.jpg)
L’Opinion publique
Montreal’s many underwater tunnel projects in the 1880s and 1890s never went beyond the design stage. High concentrations of schist in the Montreal riverbed made the construction of a tunnel very expensive.