Norway’s 6 Ula Class/ U210 diesel-electric submarines were commissioned from 1989-1992, and play an important role in their overall fleet. The 1,150t design combined German design, sonar, and torpedoes with a French Thomson-CSF (now Thales) Sintra flank array sonar. Integration happens through a Norwegian Kongsberg combat system, which has become a mainstay for German submarine types. The U210s are a bit on the small side compared to more modern diesel-electric boats, but they remain well suited to Norway’s long coasts and narrow fjords.
The Ula Class has received a number of upgrades since 2006. A new combat system, added cooling for warm water operations, upgraded periscopes, sonar improvements, TADIL-A/Link 11 communications, etc. Even so, the continuous cycle of compression and release inherent in submarine operations will make operations past 2020 a risky proposition. Norway wants to keep a submarine fleet, and by the end of 2014 decided it would need new boats to do so.