According to photographic imagery and marine forensic and photogrammetric analyses, the photo below indicates the presence of at least one midget submarine in Pearl Harbor on the morning of 7 December 1941. The same analysts who support that theory now are concentrating their search for evidence on a timeline derived from translated Japanese documents that has allowed them to determine which midget submarines were capable of entering the harbor that morning.
Attack from Below
By Commander John Rodgaard, U.S. Naval Reserve, Peter Hsu, Carroll Lucas, and Captain Andrew Biache, U.S. Naval Reserve (Retired)