Is that something similar to ohka? Or is it meant to return after launching torpedoes? It looks like a torpedo itself, must have quite a bad range I guess, with those batteries you won't get far. Besides where's the food, water, bed, loo, or anything in it? Needs perfect weather to sail too I guess, such a small thing wouldn't hold out long in the big waves and traveling underwater for long periods would be difficult, can't see much oxygen in it.
Can't see it as anything but a suicide boat, or perhaps it's meant to be towed by a real uboat or ship and released when the target is in range, how would one get back to the uboat/ship is a difficult question as well. You got me intrigued, gonna research this one a little when I get the time, or one of the experts will post a summary of this thing.
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