The Chesapeake Bay Bridge–Tunnel (CBBT, officially the Lucius J. Kellam Jr. Bridge–Tunnel) is a 17.6-mile (28.3 km) bridge–tunnel that crosses the mouth of the Chesapeake Bay between Delmarva and Hampton Roads in the U.S. state of Virginia.
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The Chesapeake Bay Bridge: An Underwater Tunnel in Virginia.
The first underwater tunnel constructed for vehicles in Virginia was the Downtown Tunnel underneath the Elizabeth River, connecting the cities of Portsmouth and Norfolk. A two-lane tunnel opened in 1952, and is now used for westbound traffic.
The Ted Williams Tunnel interface in East Boston between the land-based approach and the underwater section is 90 feet below the surface of Boston Harbor, the deepest such connection in North America.
The Twin Bores15, 1968, and was completed five years later on Mar. 8, 1973. The Eisenhower Tunnel celebrates a big milestone of Connecting Colorado for 50 Years as of March 8, 2023. This bore was originally called the Straight Creek Tunnel, and later was officially named the Eisenhower Memorial Bore.
The tunnel was built using the opentrench method -- prefabricated sections were sunk in a trench dredged in the Baltimore Harbor's bottom, and the sections were joined under water.
That's right, the Union Canal Tunnel, located in Lebanon, PA is considered the oldest transportation tunnel in the United States, having been completed in 1827.
It's the lone tunnel that goes under water in Virginia, although there are several other bridge tunnels in the state. And while you won't be able to ogle marine life from your car window on your drive... rest assured you are indeed well below the surface!