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Soryu-class Submarine

The Sōryū-class submarines (16SS) are diesel-electric attack submarines. The first boat in the class entered service with the Japan Maritime Self-Defense Force in 2009. The design is an evolution of the Oyashio-class submarine, from which it can most easily be distinguished by its X-shaped stern combination diving planes and rudders. The Sōryūs have the largest displacement of any submarine used by post-war Japan


The Soryu-class submarines are part of the Japan Maritime Self Defense Force (JMSDF), and have proven to be a potent weapon against all surface navies and submarine forces of the New World. Due to its stealthy nature and a long-range arsenal of Harpoon Missiles and Type 89 Torpedos, the submarine easily outmatch their counterparts in the Gra Valkas Empire, the Cetus-class submarines. Additionally, the crew was also trained to "stay silent" as making noise can make the submarine presence detected by sonar, allowing the enemy to attack them.


Type: Attack submarine


  • Surfaced: 2,900 tonnes (2,854 long tons)
  • Submerged: 4,200 t (4,134 long tons)

Length: 84.0 m (275 ft 7 in)

Beam: 9.1 m (29 ft 10 in)

Draft: 8.5 m (27 ft 11 in)


  • 1-shaft 2 × Kawasaki 12V 25/25 SB-type diesel engines diesel-electric
  • 4 × Kawasaki Kockums V4-275R Stirling engines - up to Shōryū
  • 3,900 hp (2,900 kW), surfaced
  • 8,000 hp (6,000 kW), submerged


  • Surfaced: 13 kn (24 km/h; 15 mph)
  • Submerged: 20 kn (37 km/h; 23 mph)

Range: AIP endurance (est.): 6100 nautical miles (11297.2 km; 7060.75 miles) at 6.5 knots (12 km/h; 7.48 mp/h)

Complement: 65 (9 officers, 56 enlisted)

Sensors and processing systems:

  • ZPS-6F surface/low-level air search radar
  • Hughes/Oki ZQQ-7 Sonar suite: 1× bow-array, 4× LF flank arrays and 1× Towed array sonar

Electronic warfare & decoys:

  • ZLR-3-6 ESM equipment
  • 2× 3-inch underwater countermeasure launcher tubes for launching of Acoustic Device Countermeasures (ADCs)


  • 6 × HU-606 21 in (533 mm) torpedo tubes with 30 reloads for:

1.) Type 89 torpedo

2.) Harpoon (missile)

  • Mines

Subs of Her Class

  • SS-501 Sōryū (そうりゅう) Blue Dragon - Lead of her class
  • SS-502 Unryū (うんりゅう) Cloud Dragon
  • SS-503 Hakuryū (はくりゅう) White Dragon 
  • SS-504 Kenryū (けんりゅう) Sword Dragon
  • SS-505 Zuiryū (ずいりゅう) Auspicious Dragon
  • SS-506 Kokuryū (こくりゅう) Black Dragon
  • SS-507Jinryū (じんりゅう) Benevolent Dragon
  • SS-508 Sekiryū (せきりゅう) Red Dragon
  • SS-509 Seiryū (せいりゅう) Pure Dragon
  • SS-510 Shōryū (しょうりゅう) Soaring Dragon 
  • SS-511 Ōryū (おうりゅう) Phoenix Dragon
  • SS-512 Tōryū (とうりゅう) Fighting Dragon

Service History

New World War

The JMSDF submarines, lead by SS-511 Oryu were responsible for sinking and disabling several surface ships of the 2nd Advance Fleet during the Great Naval Battle of Japan, thereby causing the 2nd Advance Fleet to go into a panic. With the exception of one Harpoon missile being hit by a lucky shot from an anti-aircraft cannon, the Japanese submarine fleet suffered no losses. After putting 2 torpedoes into the main flagship of the 2nd Advance Fleet, the fleet was ordered to move onto the next operation while a flight of F-2 Fighters launched 40 anti-ship missiles to finish off the fleet.

After the failed naval invasion of Japan, the JMSDF sent 4 submarines (Soryu-Class SS-507Jinryū & SS-510 Shōryū' and Oyashio-Class SS-593 Makishio & SS-594 Isoshio) to harass the GVE Navy at Western Mu Continent. The subs managed to sunk 12 GVE warships, including battleship Rigel II.