High Quality Content by WIKIPEDIA articles! Kazan is a Russian nuclear attack submarine of the Yasen-class submarine. It is the second boat of the project; as from the first it is separated by 16 years (1993-2009) considerable changes are made to its design. The submarine project has been developed in design office "Malachite" in Saint Petersburg. The Russian navy command has declared that the submarine will be improved in comparison with Severodvinsk submarine the first Yasen class submarine. Differences in the project have appeared sufficient to consider it as a new updated version (Yasen-M Russian: - ).