**OVERVIEW:** The SS 573 *Yushio* is a *Yushio*-class diesel-electric submarine (SSK) operated by the Japan Maritime Self-Defense Force (JMSDF).

**DETAILS:**
The *Yushio* class represented a significant advancement in Japanese submarine design, building upon the experience gained from the preceding *Uzushio* class. The design emphasized underwater endurance and stealth, incorporating improved sound dampening techniques and a streamlined hull form to minimize hydrodynamic noise. The program benefitted from access to some US submarine technology, as well as reverse engineering of some Soviet submarine characteristics observed during the Cold War. Construction of the *Yushio* class was undertaken domestically by Japanese shipyards, highlighting the nation's commitment to maintaining a modern and capable undersea warfare force. The class served as a crucial stepping stone in the development of subsequent, more advanced Japanese submarine classes. *Yushio* herself was commissioned in 1980 and represented the cutting edge of Japanese submarine technology at the time.

The *Yushio* class was primarily designed for anti-submarine warfare (ASW) and anti-surface warfare (ASuW) operations within the waters surrounding Japan. They were intended to provide a robust defense against potential threats from both Soviet (during their service life) and other foreign naval assets. Although not designed for open-ocean operations, their range and endurance allowed for extended patrols in the Sea of Japan, East China Sea, and surrounding Pacific waters. The class also possesses a limited mine-laying capability, enhancing their versatility. The installation of the J/ZQQ-4 sonar suite provided a significant improvement in underwater detection and tracking capabilities, enabling effective prosecution of submerged targets. The class served a crucial role in safeguarding Japanese maritime interests.

The *Yushio* is equipped with a comprehensive sensor suite to enhance its operational effectiveness. The J/ZQQ-4 is the primary bow-mounted sonar, used for active and passive detection, classification, and tracking of underwater targets. The J/ZPS-6 surface search radar provides the capability to detect and track surface vessels. The J/ZLR-3 electronic support measures (ESM) system is employed to intercept and analyze radar emissions from enemy ships and aircraft, providing valuable intelligence and situational awareness. Two submarine periscopes, one optical and one low-light television (LLTV), allow for visual observation of the surface. The six 533mm torpedo tubes can launch both anti-submarine torpedoes and anti-ship missiles, providing considerable offensive firepower. Finally, a signal ejector allows for the silent launch of decoys or communications buoys.

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

**SENSORS:** J/ZQQ-4 || J/ZPS-6 || J/ZLR-3 || Generic Acoustic Intercept || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

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