Detroit River, was the second tunnel between two nations. The St. Clair Tunnel, between Port Huron, Michigan, and Sarnia, Ontario, under the St. Clair River, was the first. Operations since 2007 In 2007, billionaire Manuel Moroun, owner of the nearby Ambassador Bridge, attempted to purchase the American side of the tunnel. In 2008, the City of Windsor controversially attempted to purchase the American side for $75 million, but the deal fell through after a scandal involving then-Detroit Mayor Kwame Kilpatrick. Soon afterward, the city's finances were badly hit in a recession and the tunnel's future was in question. Following Detroit's July 2013 bankruptcy filing, Windsor Mayor Eddie Francis said that his city would consider purchasing Detroit's half of the tunnel if it was offered for sale. On July 25, 2013, the lessor, manager and operator of the tunnel, Detroit Windsor Tunnel LLC, and its parent company, American Roads, LLC, voluntarily filed for chapter 11 bankruptcy protection in the United States Bankruptcy Court for the Southern District of New York. The American lease was eventually purchased by Syncora Guarantee, a Bermuda-based insurance company. Soon afterward, the lease with Detroit was extended to 2040. Both Syncora and Windsor retained the Windsor-Detroit Tunnel Corporation to manage the daily operations and upkeep of the tunnel. In May 2018, Syncora sold its interest in American Roads, LLC for $220 million to DIF Capital Partners, a Dutch-based investment fund management company specializing in infrastructure assets. A $21.6 million renovation of the tunnel began in October 2017 to replace the aging concrete ceiling, along with other improvements to the infrastructure. Completion of the project was initially scheduled for June 2018, but is ongoing as of 2021. Usage The Detroit–Windsor tunnel crosses the Canada–United States border; an International Boundary Commission plaque marking the boundary in the tunnel is between flags of the two countries. The tunnel is the second-busiest crossing between the United States and Canada after the nearby Ambassador Bridge. A 2004 Border Transportation Partnership study showed that 150,000 jobs in the region and $13 billion (U.S.) in annual production depend on the Windsor-Detroit international border crossing. Between 2001 and 2005, profits from the tunnel peaked, with the cities receiving over $6 million annually. A steep decline in traffic eliminated profits from the tunnel from 2008 until 2012, with a modest recovery in the years since. Traffic About 13,000 vehicles a day use the tunnel despite having