Abstract:This paper is based on a publication about subsea road tunnels in Norway from year 2002. The title of the publication is “Publication no. 98,Subsea road tunnels in Norway” of Directorate of Public Roads,Road Technology Department. The first Norwegian subsea tunnel was opened in 1983. Subsequently,24 other subsea tunnels have been built. As a result,in the 2007,a total of 25 subsea tunnels with a total length more than 100 km are open to traffic. Some new are under construction and several other subsea tunnels are also in the process of being planned,including tunnels of up to 24 km length. Most of the tunnels have one tube with two lanes,but some tunnels have an extra lane when the gradient is more than 6 %. The subsea road tunnel projects are located on the trunk roads along the coast,replacing often congested ferry connections,and establishing ferry-free connection from the main land to the communities. Experiences from these tunnels are the theme for this presentation. Generally speaking,building costs for subsea tunnels have been reduced over the years. However,costs vary a great deal from project to project. Operation and maintenance costs also vary considerably. Costs for reinvestment and equipment are particularly high. Water ingress has diminished over time,so that the need for pumping leakage water has been reduced. This study of accidents and fires in Norwegian subsea tunnels covers 17 tunnels opened before 1996. 19 personal injury accidents covering the five years from 1995 including 1999 were analyzed. The accident rate was as low as 0.09(injury accidents per mill vehicle kilometer per year). The rate was highest in tunnels with steep gradients and where annual average daily traffic(AADT) was lower than 1 500. Only three fires have been recorded in Norwegian subsea tunnels. This amounts to a rate less than 10% of the accident rate. As the study covers only 17 tunnels and 19 accidents,the results must be interpreted with this in mind.