Big Dig完工有14年以上了。

Planning began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007, The project was originally scheduled to be completed in 1998^[5] at an estimated cost of $2.8 billion (in 1982 dollars, US$7.4 billion adjusted for inflation as of 2020).However, the project was completed in December 2007 at a cost of over $8.08 billion (in 1982 dollars, $21.5 billion adjusted for inflation, meaning a cost overrun of about 190%)^[6] as of 2020.^[7] The Boston Globe estimated that the project will ultimately cost $22 billion, including interest, and that it would not be paid off until 2038.