Qualla: Fukuryu

Fukuryu: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit unknown United States Navy personnel, Public domain. The name means "crouching dragon." In practice, the Fukuryu were men in diving suits, weighed down with lead, walking along the ocean floor with explosive-tipped bamboo poles, waiting for the shadow of an Allied landing craft to pass overhead. They were expected to die -- not as a side effect of their mission, but as its explicit design. Of the 6,000 men Imperial Japan planned to train for this role, 1,200 had completed preparation when the emperor's surrender broadcast made the invasion of the home islands unnecessary. The Fukuryu program, headquartered at the Yokosuka Naval Base on the western shore of Tokyo Bay, represents the furthest extreme of Japan's Special Attack doctrine -- a weapon system built entirely around the certainty that its operators would not survive.

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Image: unknown United States Navy personnel | Public domain

Fukuryu: Walking the Bottom

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Pouazity3, CC BY 3.0. The concept was grimly straightforward. Each Fukuryu diver wore self-contained diving gear: a jacket, trousers, diving shoes, and a helmet bolted on with four fasteners. Lead weights held the diver on the seafloor. An air purification system with two 3.5-liter oxygen bottles sust...

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Image: Pouazity3 | CC BY 3.0

Fukuryu: Lines of Defense Beneath the Waves

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Pouazity3, CC BY 3.0. The tactical deployment plan was methodical. Off each beach identified as a potential Allied landing site, an inventory of mines was pre-positioned on the seafloor, anchored to the bottom for the submerged men to retrieve and use. The defensive layout consisted of three parallel ...

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Image: Pouazity3 | CC BY 3.0

Fukuryu: Yokosuka and Beyond

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Pouazity3, CC BY 3.0. The program's headquarters sat at Yokosuka, the major naval base on the western side of Tokyo Bay -- the same installation where, decades earlier, French engineer Leonce Verny had helped build Japan's first modern naval dockyard. By war's end, the 71st Arashi unit at Yokosuka had...

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Image: Pouazity3 | CC BY 3.0

Fukuryu: The Dragon That Never Struck

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Pouazity3, CC BY 3.0. The Fukuryu program existed within a broader constellation of desperation weapons that Imperial Japan prepared for Operation Ketsu-Go, the defense of the homeland. Kamikaze pilots, human-guided Kaiten torpedoes, explosive motorboats, and now men walking on the ocean floor -- each...

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Image: Pouazity3 | CC BY 3.0