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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Detroit-Windsor TunnelIt is the third oldest underwater vehicle tunnel in the United States or Canada. It stands behind only New York/New Jersey's Hudson River-crossing Holland Tunnel (completed in 1927) and the Posey Tube (completed in 1928), which connects Alameda and Oakland, California.
The Channel Tunnel (French: Tunnel sous la Manche), also known as the Chunnel, is a 50.46-kilometre (31.35 mi) underwater railway tunnel that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.
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 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.
The Port of Miami Tunnel (also State Road 887) is a 4,200-foot (1,300 m) bored, undersea tunnel in Miami, Florida. It consists of two parallel tunnels (one in each direction) that travel beneath Biscayne Bay, connecting the MacArthur Causeway on Watson Island with PortMiami on Dodge Island.
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.