What will be known as the Fehmarnbelt tunnel, will be a tunnel that descends 40 meters beneath the Baltic Sea and will connect Scandinavia and continental Europe. The goal is for this bridge to connect Northern European cities such as Copenhagen, Stockholm, Hamburg and Berlin and make travel between them much more efficient and environmentally friendly.

The Fehmarnbelt tunnel is set to be completed by 2029 and will connect the coastal towns of Rødbyhavn (Denmark) and Puttgarden (Germany). Travel between the two countries by train will take just 7 minutes and 10 minutes by car, 1 hour faster compared to the ferry or 2 hours faster than driving via the mainland of Denmark. CO2 emissions will also decreased from cars taking a shorter route. Another plus to this project is that it will also allow a connection to the Öresundsbron, the bridge that connects Denmark and Sweden, making the trip even shorter. 

According to their website, the portals are the access points to the tunnel. There will be a portal in Denmark and one in Germany. The portals will be the connection point for the railway and the freeway. The tunnel will be made up of 89 elements that will each be connected one at a time. Each standard component is 217 meters long and 73.500 tonnes in weight.