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An underwater bridge is a military structure that was employed during World War II and the Korean War. Underwater bridges, typically constructed of logs, sand and dirt just beneath the surface of the water in a river or similar narrow body of water, allow heavier vehicles to cross the river driving through only shallow water.
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. It opened in 1964, replacing ferries that had operated since the 1930s.
Tokyo Bay Aqua-Line bridge. The Tokyo Bay Aqua-Line shortened the drive between Chiba and Kanagawa, two important industrial areas, from 90 to 15 minutes, [ 11 ] and also helped cut travel time from Tokyo and Kanagawa to the seaside leisure spots of the southern Bōsō Peninsula .
An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry links. [ 1 ]
Submerged floating tunnels can be anchored to the seafloor (left) or suspended from a pontoon (right) A submerged floating tunnel (SFT), also known as submerged floating tube bridge (SFTB), suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy (specifically, by employing the hydrostatic thrust, or Archimedes' principle).
The Baytown Tunnel or Baytown – La Porte Tunnel was a two-lane underwater motor-vehicle tunnel connecting Baytown and La Porte, two suburbs of Houston, Texas.Completed in 1953, [1] it traveled northeast-southwest underneath the Houston Ship Channel and had a length of 4,110 feet (1,250 m). [2]
The Ted Williams Tunnel is a highway tunnel in Boston, Massachusetts.The third in the city to travel under Boston Harbor, with the Sumner Tunnel and the Callahan Tunnel, it carries the final segment of Interstate 90 (the Massachusetts Turnpike) from South Boston towards its eastern terminus at Route 1A in East Boston, slightly beyond Logan International Airport.
Named for nearby Fort McHenry, the tunnel is the lowest point in the Interstate Highway System under water. [2] Construction began in May 1980; the tunnel opened on November 23, 1985. Having consumed some $750 million (equivalent to $2.1 billion in 2023), it was the most expensive Interstate project until surpassed by the Big Dig in Boston. [3]