OVERVIEW: The SS 508 Sekiryu [Soryu Class] is a diesel-electric attack submarine operated by the Japan Maritime Self-Defense Force (JMSDF).

DETAILS: The Soryu-class submarines represent a significant advancement in Japanese submarine technology, being the first JMSDF submarines to be equipped with air-independent propulsion (AIP) systems. Development was initiated in the early 2000s as a follow-on to the Oyashio-class, incorporating advanced stealth technologies and improved sensor suites. The design emphasizes enhanced underwater endurance and operational flexibility in a variety of maritime environments. The Sekiryu, commissioned in 2017, represents a later build example of the class, incorporating refinements based on operational experience with earlier vessels. The AIP system, initially Stirling engines, offered significantly extended submerged endurance compared to purely diesel-electric submarines, allowing for longer patrol times and reduced risk of detection. Subsequent vessels of the class replaced the Stirling AIP with lithium-ion batteries, further increasing submerged endurance and performance.

The primary role of the Sekiryu is anti-surface warfare (ASuW) and anti-submarine warfare (ASW), contributing to the defense of Japanese territorial waters and maritime interests. The submarine's advanced acoustic sensors and torpedo armament provide a potent capability for engaging enemy surface combatants and submarines. While not primarily designed for anti-air warfare (AAW), the submarine retains a limited self-defense capability against airborne threats. The Sekiryu conducts routine patrols in the Pacific Ocean, participating in exercises and maintaining a strategic presence in the region. Her role also includes intelligence gathering and surveillance, utilizing her advanced sensors to monitor maritime activity.

The Sekiryu's effectiveness stems from its advanced sensor suite and armament. The J/ZQQ-7 bow and flank array sonar provide comprehensive underwater situational awareness, enabling the detection and tracking of surface and subsurface targets at extended ranges. The J/ZQQ-7 TASS (towed array sonar system) further enhances detection capabilities, particularly in noisy or shallow-water environments. The J/ZPS-6F surface search radar provides detection and tracking of surface contacts, while the J/ZLR-7 electronic support measures (ESM) system allows for the detection and identification of radar emissions from surface ships and aircraft. The CM010 Photonics Mast replaces the traditional periscope, providing enhanced situational awareness and improved low-light performance. The 533mm torpedo tubes provide a delivery system for advanced torpedoes, enabling engagements against enemy submarines and surface ships. The presence of a MOD launcher indicates the capability to deploy mines or other specialized payloads.

SPECIFICATION: Length: 84.0 m || Beam: 9.1 m || Draft: 8.5 m || Disp: 2900 t

SENSORS: J/ZLR-7 || Generic Acoustic Intercept || J/ZPS-6F || J/ZQQ-7 Bow || J/ZQQ-7 Flank Array || J/ZQQ-7 TASS || CM010 Photonics Mast

ARMAMENT: 533mm TT || MOD Launcher || Signal Ejector