Noun
kaiten (uncountable)
Synonym of sushi train
Kaiten pilots were all volunteers aged 18 to 20. Despite the hundreds of Kaiten launched and the many Japanese men who died in them, they are credited with causing little damage to Allied shipping. Source: Internet
In 1944 Kitakami was further converted to carry up to eight Kaiten suicide human torpedoes in place of ordinary torpedoes. Source: Internet