HNLMS Zeeleeuw (1987)

HNLMS Zeeleeuw (S803)  is a of the Royal Netherlands Navy. She entered service in 1990 as the first submarine of the walrus class, after the HNLMS Walrus was delayed for a long period following a serious fire during construction. Zeeleeuw has been deployed both for naval exercises and in combat operations around the world. Furthermore, the submarine plays an important role by performing intelligence operations. The submarine has undergone a mid-life maintenance and upgrade program between 2014–2016, and is currently in active service.

Activities

 * In 2010 HNLMS Zeeleeuw took part in Operation Ocean Shield.

Maintenance and upgrade
In 2014 the HNLMS Zeeleeuw was taken out of service after years of service by the Royal Netherlands Navy to perform maintenance and modernize its systems. During the upgrade program, the submarine was upgraded with modern systems. For example, the ageing GIPSY combat system was replaced with the more modern Guardion combat system. Besides changing the software suit, hardware components were also either replaced or upgraded with newer versions. The Medium Range Sonar (MRS) and Long Range Sonar (LRS) was replaced. In addition a new sonar was added, which is called the Mine and Obstacle Avoidance Sonar (MOAS). The Consoles and screens in the command room also were upgraded to more modern versions, while the navigation and attack periscopes went from being depended on analog sensors to digital sensors. This was done by replacing several masts. Lastly, the mark 48 torpedoes was upgraded from mod 4 to the more recent mod 7.