International Desk: The European countries Denmark and Germany are going to build the world's longest underwater tunnel. According to CNN, this tunnel will be built about 131 feet below the Baltic Sea. The two countries will be connected through this 18 km long tunnel. Work on the tunnel began in 2020 and they plan to open the tunnel to the public in 2029. As a result, the travel time is expected to reduce a lot. It will take only 7 minutes to go from Germany to Denmark by train and 10 minutes by car through this tunnel under Fehmarn Strait. At present it takes 45 minutes to cover this distance by ferry. If this half-hour time is saved in travel, it is expected to have a great impact on the business and trade of the two countries. 89 huge tunnel sections will be placed under the sea to pass under the water. As a result, the extent of excavation work is less in this construction work. The construction cost of the tunnel has been estimated at 710 million US dollars, which is about 72 thousand crores in Bangladeshi currency. Two and a half thousand people are directly working in this huge project.