(Posted comment: Commercial airlines cant fly over a militarized zone (air force, army, cia base, disclosed locations etc.) Meaning the government knew nor tried to prevent it.. More then likely allowed. Source: Secrets of the Federal Reserve
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.