 Prior to 2008, the project had been estimated at a total cost of $3.1 billion USD, however the revised project has an estimated cost of $1 billion USD (The difference in estimates partially due to differences in previous tunnel designs).Financial closing on the project was reached in October 2009.Miami-Dade County allegedly contributed $402 million, the city of Miami $50 million, and the state $650 million to build, operate and maintain it.