Japan’s most secret weapon, the two-man midget submarine was barely 80 feet long and just 6 feet wide and was capable of carrying two Type 97 Long Lance Torpedoes. Over the years, all but one have been found, and it’s clear those did not complete their mission. But historians have long puzzled over the fate of the missing sub and whether it penetrated Pearl Harbor to fire on U.S. battleships.

The compelling new evidence suggests that the sub fired its torpedoes at U.S. ships in Battleship Row before it sank.

Parks Stephenson who was the lead investigator of an underwater expedition for the signature PBS science seriessays there are accounts that indicate one torpedo fired at the USS Arizona was a dud, but he believes another torpedo hit the USS Oklahoma.

Recently discovered three sections of mysterious steel wreckage deemed by experts to be the unaccounted-for fifth and final Japanese midget submarine used against the U.S. in a top-secret mission to attack the American fleet from below on that day.

The sunken, two-man, Japanese midget sub was found more than 1,000 feet below the surface during a dive three miles south of Pearl Harbor.

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