OVERVIEW: The SS 573 Yushio is a Yūshio-class submarine, a diesel-electric attack submarine (SSK) operated by the Japan Maritime Self-Defense Force (JMSDF). Commissioned in 1988, the Yushio represents a significant advancement in Japanese submarine design and technology of its era.

DETAILS: The Yūshio class was developed in the late 1970s and 1980s as a replacement for the Uzushio-class submarines. The design emphasized improved underwater endurance, reduced noise signature, and enhanced sensor capabilities compared to its predecessor. A key design consideration was the ability to operate effectively in the relatively shallow and complex acoustic environment of the waters surrounding Japan. The class incorporated advanced noise reduction techniques, including anechoic coatings and resilient mounting of machinery, to minimize the risk of detection by opposing forces. The Yūshio class served as an important bridge between the earlier submarines and the more advanced Oyashio and Sōryū classes that followed. Construction took place at Mitsubishi Heavy Industries' Kobe Shipyard.

The primary role of the Yushio-class submarines is anti-submarine warfare (ASW) and anti-surface warfare (ASuW), contributing to the maritime defense of Japan. The Yushio’s ASW capabilities are heavily reliant on its suite of advanced sonar systems. The AN/BQR-15A is a passive towed array sonar that provides long-range detection capabilities, enabling the Yushio to detect and track potentially hostile submarines at significant distances. The J/ZQQ-4 sonar suite serves as the primary active and passive sonar system. The Yushio is also capable of conducting maritime surveillance and intelligence gathering.

The Yushio’s sensor suite allows it to effectively patrol and monitor the maritime environment. The J/ZPS-6 surface search radar provides a capability for detecting surface contacts, enhancing situational awareness. The J/ZLR-3 electronic support measures (ESM) system allows the Yushio to intercept and analyze radar and communication signals, providing valuable intelligence on enemy activity. Generic acoustic intercept sensors further augment the submarine's ability to passively detect and classify underwater contacts based on their acoustic signatures. The installation of both optical and low-light television (LLTV) submarine periscopes enables visual surveillance and target identification, particularly in littoral environments where sonar performance may be degraded. The 533mm torpedo tubes provide a potent offensive capability, capable of launching anti-ship and anti-submarine torpedoes. The signal ejector provides a means of communicating with other units and deploying countermeasures.

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

SENSORS: AN/BQR-15A || 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