Type J1 submarine


The Type J1 submarine, also called I-1-class submarine were large cruiser submarines of the Imperial Japanese Navy.
Four boats were built between 1926 and 1929.
These boats, based on the KD2 and U-139 designs, were of a junsen, or cruiser, type with an impressive range of 24,000 nm. Elderly by 1941 they were among the first Japanese submarines converted to supply duty.