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Proposals for a tunnel between Europe and North America
a theoretical transatlantic tunnel

A transatlantic tunnel is a theoretical tunnel that would span the Atlantic Ocean between North America and Europe possibly for such purposes as mass transit. Some proposals envision technologically advanced trains reaching speeds of Most conceptions of the tunnel envision it between the United States and the United Kingdom ‒ or more specifically between New York City and London. The main barriers to constructing such a tunnel are cost (first estimated $88–175 billion, now updated to $1–20 trillion) as well as limits of current materials science. Existing major tunnels, such as the Channel Tunnel, Seikan Tunnel and the Gotthard Base Tunnel, despite using less expensive technology than any yet proposed for the transatlantic tunnel, may struggle financially.

Many variations of the concept exist, including a tube above the seabed, a tunnel beneath the ocean floor, or some combination of the two.

A 1960s proposal has a 3100 mile (4989 km) long near vacuum tube with vactrains, a theoretical type of maglev train, which could travel at speeds up to At this speed, the travel time between New York City and London would be less than one hour. Another modern variation, intended to reduce costs, is a submerged floating tunnel about 160 feet (49 m) below the ocean surface, in order to avoid ships, bad weather, and the high pressure associated with a much deeper tunnel near the sea bed. It would consist of 54,000 prefabricated sections held in place by 100,000 tethering cables. Each section would consist of a layer of foam sandwiched between concentric steel tubes, and the tunnel would also have reduced air pressure. a mistake frequently repeated today. 1913 saw the publication of the novel Der Tunnel by German author Bernhard Kellermann. It inspired four films of the same name: one in 1915 by William Wauer, and separate German, French, and British versions released in 1933 and 1935. The German and French versions were directed by Curtis Bernhardt, and the British one was written in part by science fiction writer Curt Siodmak. Perhaps suggesting contemporary interest in the topic, an original poster for the American release of the British version (renamed Transatlantic Tunnel) was, in 2006, estimated for auction at $2,000–3,000.

Robert H. Goddard, the father of rocketry, was issued two of his 214 patents for the idea. The April 2004 issue of Popular Science suggests that a transatlantic tunnel is more feasible than previously thought, and without major engineering challenges. It compares it favorably with laying transatlantic pipes and cables, but with a cost of 88 to 175 billion dollars. In 2003, the Discovery Channel's show Extreme Engineering aired a program, titled "Transatlantic Tunnel", which discussed the proposed tunnel concept in detail.