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WI. A causeway was built between Dun Loagare (Eire) and Holyhead (UK) connecting both countries allowing a 6 lane motorway plus high speed and freight rail lines.

I'm thinking of a causeway at least a mile across, and up to 50 ft high to avoid inundation with waves in stormy weather.

Plus a quartet of suspension bridges in the centre of the causeway allowing sea going traffic to traverse the Irish Sea, via north or south, each bridge connected by a man made island.

Would this be plausible?

Would this be able to be built using today's technology?

What would the environmental impacts be?

regards filers.
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