Rare WWII 'Shidenkai' Fighter Salvaged After 81 Years Underwater Off Japan

On the 8th, a former Imperial Japanese Navy local fighter, the “Shidenkai” (Kawanishi N1K2-J), which had made an emergency landing on the seabed off Akune City, Kagoshima Prefecture, during the final stages of the Pacific War and had been submerged for 81 years, was successfully salvaged. This marks the second existing airframe of its kind in Japan, following the one displayed in Ainan Town, Ehime Prefecture, and is drawing significant global attention as an invaluable war relic.

The salvaged “Shidenkai” is believed to be the aircraft of Captain (Taii) Shigeo Hayashi, who was onboard. It has maintained an astonishingly good condition, with both wings and machine guns still intact, making it hard to believe 81 years have passed. This miraculous state prompted numerous expressions of surprise and joy on social media, with comments such as “It’s preserved more beautifully than I imagined” and “I’m deeply moved.” Some individuals, inspired by anime and manga, even recalled works like “The Falcon of Shidenkai.”

The “Shidenkai” was a high-performance fighter developed as the successor to the Zero Fighter, known for its distinguished service, particularly with the elite “Sword Squadron” (Ken Butai), formally the 343rd Naval Air Group. The aircraft salvaged this time is presumed to have made an emergency landing after intense combat with B-29 bombers.

This discovery is not merely the recovery of a historical artifact but is seen as a precious opportunity to pass on the memories of war to future generations. Many people have expressed their desire for its preservation and utilization, coupled with wishes for peace, stating, “It should be preserved as a war relic for a Japan that will never wage war again” and “It is valuable both technologically and as a cultural asset; we want to preserve it carefully.”

Meanwhile, the public’s keen interest in the accurate transmission of historical facts was also evident, with some pointing out misreadings of “Taii” (Captain) by certain media outlets. Moving forward, it is expected that this invaluable aircraft, after meticulous investigation and preservation work by experts, will play a crucial role in conveying the tragedy of war and the preciousness of peace.

The Context

For non-Japanese readers, understanding the background of the “Shidenkai” and the broader context of World War II in Japan is crucial.

• Shidenkai (紫電改): Officially the Kawanishi N1K2-J, the “Shidenkai” (meaning “Violet Lightning Kai” or modified) was one of the Imperial Japanese Navy’s most advanced land-based fighter aircraft during the final stages of World War II. Developed as a successor to the legendary Zero Fighter, it was designed to counter the superior Allied aircraft like the P-51 Mustang and F6F Hellcat. Known for its powerful engine, heavy armament, and robust airframe, it was a formidable adversary when flown by experienced pilots.
• Zero Fighter (零戦): The Mitsubishi A6M Zero was the primary fighter aircraft of the Imperial Japanese Navy Air Service during most of WWII. While initially dominant, by the late war, it was outmatched by newer Allied designs. The Shidenkai represented Japan’s efforts to develop a competitive successor.
• Captain (大尉 - Taii) Shigeo Hayashi: The pilot believed to have been flying the salvaged Shidenkai. “Taii” is a military rank equivalent to Captain in the Navy.
• Ken Butai (剣部隊) / 343rd Naval Air Group: Known as the “Sword Squadron,” this was an elite fighter unit of the Imperial Japanese Navy. Composed of highly skilled pilots, they primarily operated the Shidenkai in the final year of the war, engaging in fierce air-to-air combat against Allied forces, particularly American B-29 bombers and carrier-based fighters, from bases in Kyushu.
• B-29 Superfortress: A heavy bomber used by the United States Army Air Forces in World War II. B-29s conducted extensive bombing raids on Japan in the latter part of the war, making them prime targets for Japanese interceptors like the Shidenkai.
• Significance of the find: This salvaged Shidenkai is extraordinarily rare. Only one other largely intact Shidenkai airframe exists in Japan, on display in Ehime Prefecture. Its remarkably well-preserved state after 81 years underwater offers unprecedented opportunities for historical research, technological study, and public education about the Pacific War. It serves as a tangible link to a pivotal period in history and a powerful symbol for peace.