Kobben-class submarine
Vessel class
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The Kobben class is a customized version of the German Type 205 submarine. Fifteen vessels of this class were built for use by the Royal Norwegian Navy in the 1960s. The class later saw service with Denmark and Poland. The boats have since been... Wikipedia
Displacement: 435 t (428 long tons) surfaced; 485 t (477 long tons) submerged
Test depth: 180 m (590 ft)