The first 800 or so feet of the tunnel is finished with reinforced concrete. The test is raw stone. This is the spot where it switches. Side note: nailing this shot on film is one of my proudest light-painted moments.
Powdered coal would sit in these hoppers before they get mixed with water to make a slurry. Then the mixture is injected into the firebox and ignited to make a coal-powered flamethrower capable of boiling water very quickly.
Now, to add a human scale.
Harris Machinery rests under snow on the left. Two explorers enjoy the view.
The control room floats above the top of the dock atop a spiral staircase.
The Algosteel crew strikes a pose while heading through Superior Entry toward Allouez
The woman in the wall has the bed; is pulling it in; is holding you down…