[Answer] What is the world's only underwater international vehicular tunnel?

Step 1 : Introduction to the question "What is the world's only underwater international vehicular tunnel?"

...1. Detroit–Windsor Tunnel 2. Channel Tunnel 3. Gotthard Base Tunnel 4. Laerdal Tunnel

Step 2 : Answer to the question "What is the world's only underwater international vehicular tunnel?"

Detroit–Windsor Tunnel - The Detroit-Windsor Tunnel connects the cities of Detroit, Michigan, with Windsor, Ontario, underneath the Detroit River. It became the world’s first international auto traffic tunnel when it was completed in 1930 and remains the world’s only international underwater tunnel specifically for automobiles. At just under one mile long, the tunnel is the second-busiest border crossing between Canada and the United States, with 13,000 vehicles passing through each day each day. Though it was the first tunnel for cars, it wasn’t the first underwater tunnel between Detroit and Windsor. The St. Clair Tunnel was completed in 1891, and the Michigan Central Railway Tunnel was built in 1910.:

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