Future Submarine Capability
During the period 2006-2008, the Ula class will be modernized. Most notably, the submarines will get new communication equipment (Link 11), new electronic warfare support measures and a periscope upgrade. In May 2008, the contract for new sonars was signed. The first submarine will have new sonar in 21 months time, and the last in 52 months (mil.no article). The Ula class will probably be kept in service until 2020.
The MoD will decide in 2014 on a replacement submarine project around 2020.
Read more about this topic: Ula Class Submarine