Canadian Niagara Power Glass Slide - Group of men walking through the hydro tunnel

Four men (unidentified) walking in tunnel wearing hard hats and carrying flashlights.

Canadian Niagara Power Glass Slide - Men in Tunnel

Four men (unknown) standing in the tunnel wearing hard hats.

Canadian Niagara Power Glass Slide - Large Group in Tunnel

A large group of men in hard hats in the tunnel. The names of the men are unknown.

Canadian Niagara Power Company - Large group photo in tunnel

Large group of men standing in the tunnel wearing boots and hard hats.