It is to reroute a main highway to a underground tunnel under the heart of Boston, so that it will reduce the noise and pollution from the high way. The original site of the high way will be turned into a green public community area. The project is divided into fifty independent parts. It will dig down about 85 inches and the deepest dig would be 120 inches. When the project is finished, there will bee about 14 million cubic yards of earth dug out, which is more than enough to fill 14 sports stadiums.
Here is a picture of the proposed Big Dig building:
The construction first brought out in 1971. It started in 1991 and estimated to be done in five years. But it exceeded its budget too much and fell behind the schedule for years. The total cost will be about 15 billion dollars, about 6 times more than the first estimated budge 2.5 billion dollars.
During the construction of this most expensive highway, there were a lot of problem. In 2001, there were thousands of leaks in the ceiling and wall fissures. The water damaged the steel construction and fireproofing systems. It caused 10 million dollars to repair.
Here's a video that the former mass inspector general talks about the problems of the Big Dig:
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