USS Oklahoma (BB 37), showing extent of torpedo damage, after being righted.  Evidence suggests possible mini submarine strike using larger Type 97 torpedoes (800lb TNT equiv. warhead), compared to the Type 91 aerial variety (450lb).

USS Oklahoma (BB 37), showing extent of torpedo damage, after being righted. Evidence suggests possible mini submarine strike using larger Type 97 torpedoes (800lb TNT equiv. warhead), compared to the Type 91 aerial variety (450lb).

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On the island of Kiska, Alaska, an abandoned Japanese midget submarine has lain silent in the grass that has consumed its former launch facility for decades. The abandoned wreck is now part of a Pacific war memorial.

On the island of Kiska, Alaska, an abandoned Japanese midget submarine has lain silent in the grass that has consumed its former launch facility for decades. The abandoned wreck is now part of a Pacific war memorial.

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A Japanese Ko-hyoteki class midget submarine, believed to be Midget No. 14, is raised from Sydney Harbour the day after the attack.

A Japanese Ko-hyoteki class midget submarine, believed to be Midget No. 14, is raised from Sydney Harbour the day after the attack.

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"Koryu" Midget Submarines in drydock at Kure, Japan. Before and after Allied bombing. [740x1174] - Imgur

"Koryu" Midget Submarines in drydock at Kure, Japan. Before and after Allied bombing. [740x1174] - Imgur

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7 December 1941. A Japanese midget submarine after having been raised by the U.S. Navy at the Pearl Harbor Navy Yard in December 1941. This submarine had been sunk by USS Monaghan (DD-354) in Pearl Harbor.

7 December 1941. A Japanese midget submarine after having been raised by the U.S. Navy at the Pearl Harbor Navy Yard in December 1941. This submarine had been sunk by USS Monaghan (DD-354) in Pearl Harbor.

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In a drydock at Kure Naval Base, Japan, 19 October 1945. There are at least four different types of midget submarines in this group of about eighty-four boats, though the great majority are of the standard

In a drydock at Kure Naval Base, Japan, 19 October 1945. There are at least four different types of midget submarines in this group of about eighty-four boats, though the great majority are of the standard

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Japanese midget submarine being examined in Sydney in 1942. Photo shared from State Library of Victoria.  v@e.

Japanese midget submarine being examined in Sydney in 1942. Photo shared from State Library of Victoria. v@e.

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