I suspect that no sub was ever located because none was ever used. 69 years after the event, we know what happened that day in near forensic detail, so do you really think that a few subs, albeit small ones, would be missed. they would have to be carried very close to Pearl by a large, cargo-type ship or a large submarine, launched, and then recovered the same way. Don't you think some record would have been made of this deployment, which essentially would have been a separate plan in itself? Or perhaps the Japanese might have discarded the idea due to the risk of giving the plan away?
And did the IJN have a midget sub or launch vehicle in service in 1941 anyway?
You sure about that? It has been pretty well documented that they were used.
There are also plenty of pics of the Subs from 1941 and even when they were found today.
http://upload.wikimedia.org/wikipedia/commons/1/18/Japanese_midget_submarine_h54302.jpg
Japanese Submarines
Here is a pic of one that is washed up on the shores of Oahu the day after the attack.
http://www.combinedfleet.com/Pearl.htm
There is also supposed to be a photo taken from a Japanese aircraft that shows the a Midget firing her torps at the Oklahoma. (As cptsmith here has pointed out) I have not seen this picture however and have not been able to find it online. Would be cool if someone could find it.
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