The 17-mile underwater tunnel used by high-speed trains will be as deep as 1,558 feet below sea level, according to the ...
The Strait of Gibraltar tunnel project stands to link Spain and Morocco, allowing users to drive 300 metres below sea level at its lowest point for an estimated 12.8million people annually.
Morocco and Spain have been mulling over how to create a fixed connection between the two continents—either a tunnel or a bridge—since at least 1980.
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