The Big Dig Tour / Tunnel Construction 2

K. M. Peterson

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This is further into the tunnel. This section is "newer" (and hence, less finished) than the previous. There's significant work underway on the walls here, and you can see a large steel girder ahead that is in the process of being removed (it's a temporary support while the excavation is being completed but is no longer necessary when the tunnel pour is complete).

There's about 15' (4.5m) of concrete below us.