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    In order to convey water from the intake structure of the hydroelectric generating station near Terrace Bay,a tunnel through 1067 meters (3,500 feet) of solid rock had to be excavated.

    This is a photo of the underground waterway from Hays Lake to Lake Superior.

    A look at the Aguasabon generating station tunnel located in Terrace Bay, Ontario. In 1946, the town of Terrace Bay approved the construction of Hayes Lake Dam to provide water for Aguasabon Generati