Chicago Deep Tunnel Project Up The Shaft Stock Photo 1078660601970-1979,Color Image,Construction,Development,Illinois,Illuminated,Incidental People,Indoors,Manual Worker,Night,Old-fashioned,Photography,Pipe - Tube,Retro Styled,Skokie,Sunbeam,The Way Forward,Tunnel,Tunnel Boring Machine,USA,Vertical,WorkingPhotographer Photo by Micheal EarleyCollection: Fototrove © 1976 Michael EarleyLooking up 400 ft (40 stories) from the bottom of the main shaft. The two bright lights are work lights. The two larger tubes (approximately 3 ft in diameter) to the left are ventilation pipes and the long white lines that appear to be starbursts of light are actually power cables. The shaft is 40 ft wide (4 stories). The project was a 40 mile tunnel built under the Cal-Sag canal to relieve flooding in the Chicago area. Trains ran from the tunnel boring machine to the main shaft hauling the excavated rock on the return journey. Later in the construction this shaft was filled with elevators that removed the stone to the top.