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Soryu class

Diesel-powered attack submarine

Soryu class submarine

The Soryu class boats are larger than any previous Japanese submarines since the WWII

Entered service 2009
Crew 65 men
Diving depth (operational) ~ 250 m
Diving depth (maximum) ~ 500 m
Sea endurance ?
Dimensions and displacement
Length 84 m
Beam 9.1 m
Draught 8.5 m
Surfaced displacement 2 900 tons
Submerged displacement 4 200 tons
Propulsion and speed
Surfaced speed 13 knots
Submerged speed 20 knots
Diesel engines 1 x 3 900 / 8 000 hp
Electric motors ?
Missiles UGM-84 Sub-Harpoon launched form torpedo tubes
Torpedoes 6 x 533-mm torpedo tubes for Type 89 torpedoes and missiles


   The Soryu class is a new class of Japanese diesel-powered attack submarines. It evolved from Oyashio class design. The first boat, named after Japanese Imperial Navy aircraft carrier Soryu, was commissioned in 2009. Translated from Japanese it means Blue Dragon. The JMSDF plans to operate 10 of these submarines. All other boats are also named after Japanese mythological creatures.

   The Soryu class boats are significantly larger than Oyashios. Furthermore these submarines have a larger displacement than any previous Japanese submarines since the World War II.

   It can be distinguished from the Oyashio class by the X-shape rudders. Such rudder configuration was first used on the Swedish Gotland class. It is computer aided and provides the submarine with extreme maneuverability. It also enables to operate very close to seabed.

   Submarines have hydrodynamic design and are fitted with anechoic coating. Interior also has sound isolation of loud components.

   The Soryu class submarines are armed with six 533-mm torpedo tubes for the Type 89 torpedoes and UGM-84 Sub-Harpoon anti-ship missiles. Boats have high automation in combat systems.

   Theses vessels are powered by a Swedish Stirling air-independent propulsion system. The Soryu is significantly larger than Oyashio class boats, in order to incorporate this propulsion system. This system is license-produced by Kawasaki Heavy Industries. It allows to stay submerged for longer periods of time without surfacing to charge the batteries. Submerged endurance is increased from days to weeks. It also enhanced vessel's stealth and operational capabilities.

   The AIPS develops 3 900 hp surfaced and 8 000 hp submerged. Power is delivered through one shaft.


Name Laid down Launched Commissioned Status
Soryu (SS-501) 2005 2007 2009

active, in service

Unryu (SS-502) 2006 2008 2010

active, in service

Hakuryu (SS-503) 2007 2009 2011

active, in service

Kenryu (SS-504) 2008 2010 2012

active, in service

Zuiryu (SS-505) 2009 2011 2013

active, in service

Kokuryu (SS-506) 2011 2013 2015

active, in service

(SS-507) ? ? ?

under construction

(SS-508) ? ? ?

under construction

(SS-509) ? ? ?


(SS-510) ? ? ?



Video of the Soryu class diesel-powered attack submarine