Europe's incredible megaproject with PS6bn tunnel to end traffic chaos in top tourist city / Will overcome setbacks & complete world's largest tunnel, says Revanth / Challenge of the century: What exactly is involved in digging a tunnel from Spain to Morocco? / The incredible PS6bn tunnel linking Africa to Europe dealt fresh blow over terrain concerns / The incredible PS5.9bn underwater tunnel connecting two European countries / German tunnelling specialists 'awarded contract to assess feasibility of Spain to Morocco underwater train' - reports / The tunnel linking two pretty European countries set to reopen after PS207m project / Norway's underwater tunnel: Changing the way we travel / $20 trillion tunnel that could link New York and London in an hour / Norway building world's longest, deepest undersea road tunnel