Submarines of the Imperial Japanese Navy
Imperial Japanese Navy submarines originated with the purchase of five Holland type submarines from the United States in 1904. Japanese submarine forces progressively built up strength and expertise, becoming by the beginning of World War II one of the world's most varied and powerful submarine fleets.
Japanese submarine I-180
Japanese submarine "I-180 (originally I-80") was a "Kaidai" type ("KD7" sub-class) cruiser submarine of the Imperial Japanese Navy during World War II. Ordered in 1939 under the 4th Naval Armaments Supplement Programme, she was laid down at the Yokosuka Naval Arsenal on 17 April 1941 as "I-80". Launched on 7 February 1942, she was renumbered "I-180" on 20 May 1942, and completed on 15 January 1943.