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  • Boston's Big Dig Tunnel to Reopen - The Washington Post

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  • Big Dig collapse: mistake or crime? - The Boston Globe

    Jul 11, 2007 · The National Transportation Safety Board found problems with the bolt-and-epoxy system used to hold the 4,600-pound concrete ceiling slabs in the Big Dig connector tunnel.

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  • 'Epoxy Creep' Main Factor in Big Dig Ceiling Panel Collapse ...

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    Jul 09, 2007 · WASHINGTON -- Federal investigators singled out a cause Tuesday for the collapse of tons of ceiling panels that crushed a motorist last year in Boston's problem-plagued Big Dig tunnel: the glue. The collapse could have been avoided if designers and construction crews had considered that the epoxy ...

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