BOSTON - NOVEMBER 19: Cars and trucks drive along the "Big Dig" Interstate 93 North tunnel November 19, 2004 in Boston, Massachusetts. More than 400 leaks have been discovered recently, due to faulty watereproof panels along the Interstate 93 section of the nation's costliest federally funded transportation project. Already at 14.6 billion dollars, Big Dig officials expect the leaks to cost upwards of 10 million more, and years to fix. (Photo by Darren McCollester/Getty Images)