The Oyashio-class entry covers the full class rather than an individual boat.
The Oyashio class represented a major step in Japanese conventional submarine design. Built for the JMSDF from the 1990s, the class improved endurance, sensors, and underwater performance over earlier boats. It provided Japan with a sizeable modern SSK fleet before the Soryu and Taigei programs continued the line.
The class is a diesel-electric attack submarine built for stealth, surveillance, and torpedo employment.
The class uses diesel-electric propulsion, a hydrodynamic hull, torpedo tubes, and sonar systems intended for demanding undersea operations. Its larger size supports better system integration and patrol endurance than preceding classes. Although sometimes miscategorized as an SSN in metadata, it is a conventional diesel-electric submarine, not nuclear-powered.
The class strengthened Japanese sea control and anti-submarine surveillance around regional choke points.
In operational terms, Oyashio-class submarines patrol Japan's surrounding seas, monitor submarine and surface movements, and train crews for newer undersea platforms. Their quietness and familiarity with local waters make them valuable in a defensive maritime strategy. Even when individual hulls become training submarines, the class continues to contribute to readiness.
| Name | Country | Status | Service Year | Description |
|---|---|---|---|---|
JS Isoshio (SS-594) | 🇯🇵Japan | ACTIVE | 2002 – Present | Oyashio-class submarine |
JS Makishio (SS-593) | 🇯🇵Japan | ACTIVE | 2001 – Present | Oyashio-class submarine |
JS Uzushio (SS-592) | 🇯🇵Japan | ACTIVE | 2000 – Present | Oyashio-class submarine |
JS Michishio (SS-591) | 🇯🇵Japan | ACTIVE | 1999 – Present | Oyashio-class submarine |
JS Oyashio (SS-590) | 🇯🇵Japan | ACTIVE | 1998 – Present | Lead Oyashio-class submarine |
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