it's not japan Kaiten:
Kaiten was similar but not build with 2 torpedoes...
also that the Kaiten was a suicidal torpedo with no cockpit....
the pilot stay in the belly and saw using a periscope.
it's not italian
italian human torpedoes, called Maiale (the pig), is a torpedoes with a chair over.... i mean the subs use it like a under -sea motorbike approaching the ships in silent with the purpose to mine them.
the italian human torpedoes's succesfull have ispired the german navy , kriegsmarine, who try his way so
this is the german human torpedo called the " NEGER" ,
it was build in number of 200 unit, using two G7 torpedoes, one of them modified to have a cockpit for the driver
who approach the target and relase the torpedo to hit him, but sometimes the relase mechanism doasn't work ...
so the armed torpedoes sometimes dragged the pilot in its crowds run ....
also that the oxigen mask( was a luftwaffe equipment) work bad too causing the dead of the driver.....
140 negers were lost in action for those cause....