It is one of the biggest hydroelectric power plants in the world. Embedded nearly half a kilometer beneath the Cambrian Shield, its massive powerhouse creates enough energy to light three cities - forever. When it was built, Churchill Falls was the largest construction project in the free world. Harnessing this force of nature in the wilds of Labrador would become a battle against the elements and the odds. For Canada, Churchill Falls was an economic engine. For Newfoundland, a tainted coming of age. For the men who built it, an undertaking that challenged the bounds of engineering itself... the creation of a cathedral.