Used by the IJN in the final stages of WWII, the Kaiten was a Type 93 torpedo modified as a one-man suicide weapon, although provisions were made for the pilot to escape before impact. In practice, however, none attempted to escape. With over 400 Kaitens built, only 100 were ever sent on missions, and out of those 100 missions only two succeeded in sinking enemy ships. In the end, the unmodified, unmanned Type 93 torpedo used conventionally was a much more effective weapon.

This book tells the poignant story of the men and machines of the Kaiten, with many b&w and color photos, maps, charts, and illustrations, with photos of all the Kaiten pilots and even letters from several. All text in Japanese. This book was released in conjunction with the release of a film about the Kaiten,Deguchi no Nai Umi (International title: Sea Without Exit).