A bridge across the Atlantic?

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Well, not the whole Atlantic, just a small part of it. This photograph shows a bridge in Scotland which, technically, spans part of the Atlantic Ocean. It's a well-known tourist attraction which has its picture taken many times each year - and I have been one of the photographers. But think about it - how cool would a bridge over the entire Atlantic Ocean (or a tunnel suspended under the surface) from the USA to Ireland or maybe Scotland be? Believe it or not the engineering problems and the economics of just such a plan have been studied. It's not likely to be a bridge/tunnel where you can drive your own car but is more likely to be similar to the Channel Tunnel between the UK and France which is a rail tunnel transporting vehicles of all sizes on special carriages. It's not gonna happen any time soon but, with advances in engineering techniques and materials science who knows what might come in the future? https://en.wikipedia.org/wiki/Transatlantic_tunnel