Despite opposition from backers of the recently opened Ambassador Bridge, an underwater motor vehicle tunnel was opened to traffic on this day in 1930, becoming the first underwater international roadway tunnel.
Michigan Every Day.
Zlati Meyer, “This week in Michigan history: Detroit-Windsor Tunnel opens in 1930″, Detroit Free Press, November 3, 2013.
Eric D. Lawrence, “Happy 85th birthday, Detroit-Windsor Tunnel”, Detroit Free Press, November 3, 2015.
History of the Detroit/Windsor Tunnel, courtesy of the Windsor Public Library, 2001.