Blimey. Took me a long time to watch it
Anyway, it turns out that midget sub No.5 managed to get into Pearl Harbour and fired it's torpedoes at either the
Arizona or the
Oklahoma and
West Virginia. One of its torpedoes was a dud, and was recovered by the US navy not long after (If it discharged both torpedoes at the Arizona, both were duds or one missed). The submarine sent out a signal (it attacked on the surface) to it's mother sub. The signal,
Kira, is believed to be a misspelling of
Tora, due to the stress of operating a midget sub. The sub quickly escaped to west loch, were it's crew detonated scuttling charges, blowing the sub in two and killing themselves. It remained there until the west loch disaster of 1943, when it was gathered with the sunken US LCTs, cut into three, and dumped outside the harbour.
Here's more information on the west loch disaster:
http://en.wikipedia.org/wiki/West_Loch_disaster
Soon I'll post a photo of what
may be midget sub No.5 firing at battleship row, unwittingly taken by a Japanese airman.