The Big dig

It was a massive mega-project in the city of Boston whose purpose was to relieve traffic congestion along I-93. The plan was to build an enormous 3.5 mile tunnel underneath the city of Boston to help relieve some of this traffic which had gotten worse year after year. The project broke ground in 1991, and it became the most expensive highway project ever in the United States. As of 2006, the Big Dig project cost $14.6 billion. Workers encountered many obstacles while digging the enormous tunnel including glacial debris, buried homes, and even sunken ships. The tunnel had many problems with leaks as it neared completion, but they were eventually fixed. There is one death that is solely contributed to the Big Dig project, which occurred when a 3 tonne piece of concrete ceiling collapsed onto a car, killing the passenger of the car and injuring the driver. Work on the Big Dig project concluded on December 31, 2007. It was one of the biggest projects of its kind in the world.