4. Shield at Boston Vent Shaft (July 19)

Black-and-white photo of the interior of the Boston Vent Shaft

“Shield at Boston Vent Shaft (July 19).”
In this photograph, you can see the front of the tunneling shield as it first came into the Boston Vent Shaft. The shield pushed all of this dirt into the shaft as it moved. The workers poked out at the top of the pile of dirt. They must have been happy to see the light at the end of their long tunnel and get some fresh air!

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