"One hundred men, one hundred U.S. capital ships destroyed"
- Hiroshi Kuroki
*Kuroki is the co-inventor of Kaiten, and is the one who primarily came up with this idea of a suicide manned torpedo.
What is a Kaiten? 
A Kaiten was a manned suicide torpedo Japanese Imperial Navy used towards the end of World War Two as the last hope, as the name Kaiten, pronounced [Ki: ten], means 'return to heaven' or 'return to glory' in Japanese. Around 400 of them built between 1944 and 1945. ​
* A picture of the seven virtues of Bushido ​
​Bushido, an old Japanese war code, was used as a military strategy to inspire soldiers to sacrifice for a greater cause. National religion “Shinto” was used to enshrine kaiten pilots died in battles, worshiping them as "kami", or war god. 
"Bushidō. . . is the code of moral principles the samurai were required or instructed to observe . . . It is a code unuttered and unwritten . . . an organic growth of decades and centuries of military career." 
                                                                                                       
                                                                                                                              ---- Nitobe Inazō, Bushidō: The soul of Japan. ​

​This is a video showing the Navy's oiler USS Mississinewa (AO-59) burning and sinking on November 20th, 1944, after being struck by a Japanese kaiten at 5:45 AM in the morning, at Ulithi Atoll.