Transatlantic tunnel crosses Atlantic Ocean
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 500 to 8,000 kilometres per hour (310 to 4,970 mph). 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.
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