The 17-mile underwater tunnel used by high-speed trains will be as deep as 1,558 feet below sea level, according to the project planners.
The contract, officially signed on November 6, specifies that the seismic equipment will be capable of measuring activity up to 6,000 meters below sea level ... risks for Gibraltar tunnel project ...
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.
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