This photograph is in the public domain in Japan because its copyright has expired according to Article 23 of the 1899 Copyright Act of Japan (English translation) and Article 2 of Supplemental Provisions of Copyright Act of 1970. This is when the photograph meets one of the following conditions: It was published before 1 January 1957. It was photographed before 1 January 1947. It is also in the public domain in the United States because its copyright in Japan expired by 1970 and was not restored by the Uruguay Round Agreements Act.
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The subject of this photo is a Kiraisen minelaying submarine built in 1926 patterned after a first world war German U-boat. This submarine was originally number 48, renumbered I-21 when this photo was taken in 1930, and renumbered I-121 when a new B Type submarine I-21 was built in 1939. B Type submarines had a streamlined seaplane hangar forward of the conning tower where a formation of sailors appears in this image. The seaplane catapult required the gun to be mounted aft of the conning tower in B type submarines, rather than forward like the gun in this image.