WWII Japanese Kaiten manned torpedo.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h..._submarine.jpg
Previously:
https://www.homemadetools.net/forum/...466#post169900
https://www.homemadetools.net/forum/...964#post164328
https://www.homemadetools.net/forum/...562#post166750
https://www.homemadetools.net/forum/...140#post157564
https://www.homemadetools.net/forum/...330#post150494