OVERVIEW: The SS 516 Raigei [Taigei Class] is a diesel-electric submarine of the Japan Maritime Self-Defense Force (JMSDF), commissioned in 2025. It represents a significant advancement in Japanese submarine technology, incorporating enhanced stealth features and advanced sensor suites.

DETAILS:
The Taigei class of submarines represents the latest generation of diesel-electric submarines designed and built for the JMSDF. Development began in the early 2010s as a successor to the Soryu-class, incorporating lessons learned from the operation of earlier designs and adapting to the evolving underwater warfare environment. A primary design goal was the reduction of acoustic signature to enhance survivability in contested waters. This focus on stealth has resulted in modifications to hull design, internal machinery arrangements, and the implementation of advanced sound dampening technologies. The class also emphasizes automation to reduce crew workload, reflecting the increasing complexity of modern submarine operations. The Raigei is the second vessel of this class.

The Raigei is primarily intended for anti-submarine warfare (ASW) and anti-surface warfare (ASuW), serving as a critical component of Japan's maritime defense strategy. The platform's enhanced sensor suite allows for long-range detection and tracking of both surface and subsurface targets. While not explicitly designed for anti-air warfare (AAW), the submarine possesses the capability to engage aerial threats at close ranges with self-defense measures. The vessel also contributes to intelligence, surveillance, and reconnaissance (ISR) activities, providing valuable information on maritime activity in the region. The Raigei is expected to play a key role in maintaining maritime security and protecting Japan's strategic interests.

The Raigei's combat effectiveness is significantly enhanced by its advanced sensor and weapon systems. The J/ZQQ-8 bow, flank array, and towed array sonar suite provides comprehensive underwater situational awareness, enabling long-range detection, classification, and tracking of targets. The J/ZLR-7 electronic support measures (ESM) system intercepts and analyzes radar signals, providing valuable intelligence and early warning of potential threats. The CM010 Photonics Mast replaces the traditional periscope, offering improved visual and infrared observation capabilities. The submarine's 533mm torpedo tubes are capable of launching a variety of modern torpedoes, while the MOD launcher provides options for deploying mines or other specialized payloads. The signal ejector supports communication and decoy deployment, increasing the submarine's operational flexibility and survivability. The J/ZPS-6H navigation radar provides navigation and surface search capabilities. A Generic Acoustic Intercept system is also fitted for enhanced situational awareness.

SPECIFICATION: Length: 84.0 m || Beam: 9.1 m || Draft: 8.5 m || Disp: 3000 t

SENSORS: J/ZLR-7 || Generic Acoustic Intercept || CM010 Photonics Mast || J/ZPS-6H || J/ZQQ-8 Bow || J/ZQQ-8 Flank Array || J/ZQQ-8 TASS

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