The most expensive public works project in the U.S. , which spans 7.8 miles and took 13 years to build, topped out at $14.6 billion. Costing $8 billion more than anticipated.
In 2006, Milena Del Valle was killed when a concrete ceiling panel fell on their car while in the tunnel. Because the death of Del Valle was determined to be caused by inferior construction materials, many of the Big Dig's construction methods and materials being used were called into question. Aggregate Industries, the largest concrete supplier for the underground portions of the project, were discovered by the MA State Police to have been using substandard concrete during the construction of the tunnel. Massachusetts Governor Mitt Romney announced he would return $3,900 in political contributions from employees of Aggregate Industries.
The tunnel was said to have had thousands of leaks and an additional $52 million was spent on repairing the leaks in recent years.
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