But what of the fifth Japanese mini-sub?
There's been evidence for decades - particularly an intercepted radio transmission from the day after the ambush reporting on the success of the mini-sub - but no hard proof of the role it might have played. Historians have debated it for years.
But today history has one less mystery. The scuttled remains of the fifth Japanese mini-sub have been found three miles south of Pearl Harbor, its 800-pound torpedoes emptied and likely fired at the battleships West Virginia and Oklahoma and perhaps causing enough damage for the latter to capsize in in one of the most iconic destructive acts of the raid.
Amazing, isn't it? That even today, there are still things we don't know about World War II that every so often finally come to light.
Even as we remember those who fought and served and even perished in this most terrible of conflicts, let us pray that there may never again be such an occasion for enigma.