Researchers have discovered the remains of a Japanese mini-submarine they say was used to attack Pearl Harbor on Dec. 7 1941, the Los Angeles Times reports.

The discovery provides evidence that the submarine fired its torpedoes at Battleship Row and could therefore resolve a long-standing dispute among historians, the paper reports.

Five mini-submarines were intended to be used to launch a strike against Pearl Harbor, but four ended up not being used for various reasons, the paper reports. No one knew what happened with the fifth sub.

New evidence now indicates that the remaining sub fired its two 800-pound torpedoes likely at battleships West Virginia and Oklahoma, the paper reports. Researchers believe the sub capsized after the attack and that its crew then scuttled it in West Loch, according to the paper.

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