The Sea Dagger series of submarines are special operations vehicles developed by Kockums of Malmo, Sweden, now owned by HDW of Germany. The small stealthy submarines are tailored for five types of missions: attack; autonomous swimmer delivery; surveillance and minehunting; and as a target vehicle for antisubmarine warfare exercises and training.
The Sea Dagger variants are constructed from three modules, the bow and stern modules and one chosen from four specific mission module options. The submarines are small, with displacement in the range of 55t to 72t, a length of between 16 and 20m, a height of 3.6m and a diameter of 2.5m.
The four variants of Sea Dagger are equipped with sonar, communications systems, and a comprehensive navigation suite including a navigation computer, a gyroscope compass, speed log, depth gauge, echo sounder, global positioning system, navigation radar and optronic mast.
The concept consists of six modules: one and two the bow and stern, with the remaining four specific mission modules.






