OVERVIEW: The SS 566 *Uzushio* is a *Uzushio*-class diesel-electric submarine operated by the Japan Maritime Self-Defense Force (JMSDF). Commissioned in 1975, the *Uzushio* class represented a significant advancement in Japanese submarine design and indigenous shipbuilding capability.

DETAILS: The *Uzushio* class was developed in the early 1970s as a direct successor to the earlier *Oshio* class, incorporating lessons learned in their operation and seeking to improve upon their capabilities, particularly in the areas of underwater endurance and sonar performance. The design emphasized a teardrop hull form to minimize hydrodynamic drag and reduce underwater noise signature. The class also incorporated improved battery technology, resulting in extended submerged patrol times compared to its predecessors. Construction of the *Uzushio* class marked a shift towards increased reliance on domestically produced components and technologies within the JMSDF's submarine program. The *Uzushio* class were at the forefront of JMSDF submarine technology during the Cold War, providing a crucial forward defense against Soviet naval power.

The primary role of the *Uzushio*-class submarines was anti-submarine warfare (ASW), focused on detecting and neutralizing hostile submarines in the waters surrounding Japan. They were also capable of anti-surface warfare (ASuW), posing a threat to enemy surface combatants. While not specifically designed for anti-air warfare (AAW), the submarine could contribute to overall maritime situational awareness, relaying information to other JMSDF assets. The *Uzushio* class submarines routinely participated in exercises with other JMSDF surface ships and aircraft, as well as with allied navies, to maintain a high level of operational readiness and to refine tactics and procedures.

The *Uzushio*'s sensor suite allowed for effective detection and tracking of underwater and surface targets. The J/ZQQ-1 sonar system provided both active and passive detection capabilities, enabling the submarine to locate targets at considerable ranges. The J/ZPS-4 surface search radar allowed for surface navigation and detection of surface contacts. The generic acoustic intercept equipment enabled the submarine to monitor enemy sonar emissions, providing valuable intelligence and situational awareness. The inclusion of both optical and low-light television (LLTV) periscopes allowed for visual reconnaissance and target identification, especially in littoral environments. The submarine's two 533mm torpedo tubes were capable of launching a variety of torpedoes for engaging both submarine and surface targets, while the signal ejector was likely used for communication and decoy purposes.

SPECIFICATION: Length: 72.0 m || Beam: 9.9 m || Draft: 7.5 m || Disp: 1850 t

SENSORS: J/ZPS-4 || J/ZQQ-1 || Generic Acoustic Intercept || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

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