Denmark has started sinking 89 mega concrete blocks that are 712 ft. long and roughly 81,000 tons each into the Baltic Sea to build the world’s longest immersed tunnel, intended to link the country to Germany in a 10-minute drive, and about 7 minutes by train OkDiario
The world's largest immersed tunnel is being sunk in 79 concrete segments between Germany and Denmark to shorten the Hamburg–Copenhagen journey by 4 hours. en.clickpetroleoegas.com.br