Is there a bridge in the United States that goes underwater?
The Chesapeake Bay Bridge: An Underwater Tunnel in Virginia.
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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 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.
Sea bridges are bridges that carry vehicle or railroad traffic ways across the sea. Here are some of them: Donghai Bridge connects mainland Shanghai and the offshore Yangshan deep-water port in China. It is one of the longest cross-sea bridges in the world.
In terms of underwater tunnels in general, though, the top honor goes to the Channel Tunnel, which connects England and France by rail. Its submerged portion runs for 37.9 kilometers, the longest of any underwater tunnel in the world.