In addition to the immersed tunnel on the sea-floor, the solution includes two access ramps on land. If necessary, one or two ‘ventilation islands’ can also be built in the Fehmarnbelt to handle air quality during operation and in case of fire.

The immersed tunnel solution will use the latest construction methods as well as ventilation and safety principles. New construction methods for the immersed tunnel elements can optimise significant parameters such as time, economy and quality.

The design of the ventilation system for the 20 km long tunnel for road traffic will pose a technical challenge. The ventilation system is vital for reasons of both health and safety.

Modern motor vehicles are less harmful to the environment than previously and environmental demands on the automobile industry will become even more stringent in the future. With this taken into consideration, using modern ventilation principles means that it will be possible to build longer tunnels whilst at the same time complying with health and safety limitations.

In recent years a number of countries have experienced serious accidents in tunnels. This has increased demands for better planning and efforts to improve safety in tunnels. This new knowledge will be included in the immersed tunnel project in Fehmarnbelt.

When the tunnel is finally placed, it will be buried beneath the sea-floor, where it will have a minimal effect on sea traffic, currents and salt balance.

All graphics are from the Feasibility-studies and illustrates examples of possible technical solutions but should not in any way be considered as final variants.