By the fall of 1944, an arsenal of purpose-built suicide weapons was in advanced production. These included a manned rocket, the Oka (“cherry blossom”), which was dropped from a larger aircraft and dove on enemy ships at velocities approaching the speed of sound. A one-man suicide submarine called the Kaiten (“heaven shaker”) was released by a larger “mother” submarine; its pilot would drive it into an enemy hull like a torpedo. A small wooden speedboat called the Shinyo (“ocean shaker”) carried a two-ton warhead, and could charge into the midst of an enemy fleet at 50 knots. Fukuryus,
  
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