
The Kaidai IIIb type or I-56-class followed the design of the KD3a with strengthened hulls, strongly influenced by German U-Kreuzer designs. Full dev. and career U56-U61 naval-encyclopedia.com/ww2/japan/kd3b… #nihhonkaigun #japanesenavy #imperialjapanesenavy #i56 #japanesesubmarine #japanesesub

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