3. Shield at Boston Vent Shaft (July 20)

Black-and-white photo of the interior of the Boston Vent Shaft, with workers standing on a platform

“Shield at Boston Vent Shaft (July 20).”
This photograph is of the interior of the Boston Vent Shaft before it became the North End Sumner Tunnel Ventilation Building. The tunneling shield had just breached the vent the day before. From here, workers would clean out all of the dirt and then set up the shield again for its long journey under Boston Harbor.

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