Hopes that one of the world's most 'ambitious undersea' projects would be finished ahead of the 2030 World Cup have been ...

The 17-mile underwater tunnel used by high-speed trains will be as deep as 1,558 feet below sea level, according to the ...

While some engineers have suggested a bridge as a more feasible alternative, advancements in rail technology have tipped the scales in favour of an undersea mega tunnel.