A Boston civil engineer warns that the $1.9 billion highway tunnel slated to be built under downtown Seattle faces large challenges due to high water pressure and varying soil conditions. The findings by Thomas Neff, a consultant hired by Seattle's mayor, mirrored those found by a consultant hired by the Seattle City Council, but while that consultant said the risks could be managed, Neff called the tunnel's challenges "unprecedented" and the model for potential cost overruns "unbelievably complicated."

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