Intro Photo_ Shield in Final Position

Black-and-white photo of workers standing inside Sumner Tunnel

“Shield in Final Position.” Here is the Sumner Tunnel tunneling shield in its final position after breaching the Boston Vent Shaft. Presumably, that means it was all set and ready to start digging under Boston Harbor. These men were standing at the back of the shield. You can see how the tunnel was constructed behind it as the shield moved on.

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