The I-121 class submarine (伊第一二一型潜水艦,, I Dai-121-gata Sensuikan) was a class of submarine in the Imperial Japanese Navy (IJN), serving from the 1920s to the Second World War. IJN classed it as a Kiraisen (機雷潜, Minelayer submarine).
The Empire of Japan received six U-boat as compensation payment after World War I. Then IJN copied U-125 and designed the I-21 class (later renamed I-121 class) minelayer submarine. 6 boats were ordered, of which 4 wer...
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I-121 class submarine
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